Two omnipotent beings battles to the death

Black Goku

Natural Abilities

Cloning: These clones are unstable and if they were hit, they would disperse, but can immediately reform themselves after. They have the physical might as Black himself. The clones and the rift dissipate once Black goes too far away. Can only be used when he cuts dimensions / tears with his Fierce God Scythe

Black Power Ball

Black Kamehameha: Pretty much a black version of Goku's Kamehameha: Can be upgraded to the Super Black Kamehameha as Super Saiyan Rose

Instant Transmission

Ki Sense

Shockwave

Black God Split Cut: As Super Saiyan Rose, he uses an enhanced version of it, the Fierce God Slicer

Energy Javelin Shots

Dimension Sword Rush-like attack: The ability to release long ranged energy slashes by swinging his blade. When used with the scythe, in one swing, Black was able to create a large tear itself. Fed off an evil energy that blocked Goku's usage of the Instant Transmission

Fierce God Slicer (scythe): A more powerful version of the Aura Slide technique, attained by Goku Black after he turned his anger into power. It's capable of opening a rift in the universe to an unknown place or time which would release an evil energy.

Cloning: Through the usage of the Fierce God Slicer, Black can summon clones made of vapor but they can only disappear should Black leave the area

Saiyan Power: Through possessing a Saiyan body, Black becomes stronger the more he battles and when he recovers from injuries sustained in combat. Black's healing factor and subsequent power boosts far surpass that of other Saiyans, even Goku and Vegeta. The rate of these power ups is astonishing to the point where he can continuously increase his power level multiple times in a very short span of time.

Reactive Evolution: Due to possessing Goku's body now every single time Black gets damaged he is able to evolve stronger than before such as when Goku being enraged beat him down a lot Black then countered attack and easily defeated the latter with his new power boost

Mimicry: Black is also capable of imitating anything that he learns from Goku in battle due to them sharing the same body. Used this in his fight with Super Saiyan 2 Goku in order to learn his fighting style and become stronger as a result. Did a similar thing when fighting Vegeta, recognizing anger as source of power for Saiyans and mimicking that to further increase his power.

Meteor Blow

Break Strike

Solar Flare

Transformation

Super Saiyan Rose

Black's version of the Super Saiyan Blue

Zamasu

Martial Arts Skills

Great Intelligence

Ki Manipulation

Immortality

Gears

Potara Earrings

Time Ring

Merged Zamasu

Martial Arts Skill

Immortality

Divine Justice

Non-corporeal projection after death

Infinite Zamasu

Non-Corporeal

Able to rip through space and time

Erasure blasts

Feats

As Goku Black, he fought on par with Super Saiyan 2 Goku in BASE FORM

As Goku Black, he took hits from him in base and laugh it off then when he transformed into Super Saiyan Rose he beat down Super Saiyan Blue Vegeta and Goku without much issues even after Goku got angry and beat him down Black grew stronger and beat him down again

Though defeated as Fusion Zamasu, he became a non-corporeal being that merged with the universe of the future timeline. As a result, killing nearly everyone on Earth, Zamasu became an omnipresent god and was about to spread across the time-space continuum also capable of affecting the present timeline as he was breaching it until he was wiped from existence by the erased future's version of Zeno.

Weakness

Extremely cocky

Arrogant

Short-tempered

As only Future Zamasu became immortal while Goku Black is not, this made half of Fusion Zamasu's unable to tank a majority of attacks. This ended up deforming his body, not making him fully imortal again.

The holy weapon spirit sword killed him in his broken down phase.

Can be erased by creator level beings like Zeno

Jean Grey

Natural Abilities

Telekinesis

Intelligience

Flight

Mind Control

Mind Manipulation

Pain Induction

Personality Alteration

Telepathic Camouflage

Cloak Mind

Psionic Shield

Telepathic Illusions

Intelligence

Dark Phoenix

Most advanced telepathy

Most advanced telekinesis

Limitless energy and matter manipulation

Resurrection

Omnipotent

Omnipresent

Advanced reality-warping

Time travel and time manipulation

Energy Absorption

Death

Feats

Destroyed Shi'rai battlecruisers without breaking a sweat

Defeated Gladiator, Apocalypse, Sentry, Hulk, Wolverine, Magneto

Impressed The One Above All

Considered to be more powerful than the Beyonder, Franklin Richards, Sentry, Living Tribunal, Molecule Man, Hulk, Thor, Hyperion, Gladiator, Silver Surfer and any Omega Level Mutants

Defeated Professor X in a pysic battle

Healed a wounded universe

Killed several mutants with her phoenix force without even moving

Can even caused Gladiator to fear getting killed by her

Killed Apocalypse

Weakness

Poccesses the strength of an ordinary human female

Not very confident in herself

Killed by Wolverine

One shotted by Thor

Dark Phoenix still needs a host, and if that host dies then Phoenix will be temporarily killed until her eventual revival.

Some depictions of Dark Phoenix offer no superhuman durability to her host.

Fight

Ruined city

In a dark gloomy city, demolished buildings lay sprawled around the area.

Human and non-human corpses lay on the floor as the sound of men and women shouting could be heard.

A group of men and women saw a black cladded figure and one of them shouts.

Man: There he is!

The figure seems turns and he smirks at the human survivors.

He is Black Goku, the dark, evil and seemingly twisted version of Goku.

Another man loads up his gun and he shouts.

Man: Let's nail this bastard!

The men and women opens fire at Black Goku, determined on taking him down.

However, Black Goku smirks as he waves his hands around, catching every single bullet with his bare hand.

The human survivors widens their eyes in horror as Black Goku opens up his hand, letting the bullets rain onto the ground.

Black Goku then fires a ki blast at them, causing a massive explosion.

KABOOM!!!!

Black Goku smiles as he watches the explosion die down.

Across him, Zamasu stares down at the corpses around him.

Bodies of characters like Tracer, Akame, Captain America, Batman, Iron Man, Hulk, Thor, Hellboy, Meliodas, Shantae, Shovel Knight, Rey, Supergirl, Ange, Katniss Everdeen, Lara Croft, Jill Valentine, Sonya Blade, Ethan Hunt, Jessica Jones, Leone and Samus Aran could be seen littered across the floor.

Zamasu scoffs and he said to himself.

Zamasu: Humans. They will never learn.

Black Goku flies up to him and he said.

Black: These pathetic mortals shall never stand in the way of the true god!

Just then. Black and Zamasu heard a sound, causing them to turn.

A little girl is sobbing while hugging her dead parents while Trunks and Mai are kneeling next to her.

Realizing what is happening, Trunks cursed.

Trunks: Oh no!

Black and Zamasu flies towards Trunks and Black Goku said to him.

Black: I have grown tired of you Trunks!

Black Goku and Zamasu fires a ki blast at Trunks.

Mai screams and she embraces the little girl while Trunks shields himself with his arms, bracing himself for a painful blow.

However, all of a sudden, the ki blasts exploded unexpectantly, causing Black and Zamasu to widen their eyes in horror.

Black: What?!

???: That's enough.

Trunks, Mai and the little girl looks as a tall figure lands in front of them.

Black Goku and Zamasu narrows their eyes at the newcomer.

The newcomer is a tall young woman with red hair cladded in a yellow and blue spandex suit.

Zamasu questions.

Zamasu: Who dares interfere with the affairs of the Gods?

The woman answers defiantly.

Jean Grey: I am Jean Grey, and your evil over these people ends here.

Black Goku chuckles and he declares.

Black: My dreams of a beautiful utopia shall be realized!

Black Goku charges forward.

However, Jean Grey closes her eyes and she concentrates.

Black Goku widens his eyes as he felt a sharp stinging pain in his head, causing him to scream in pain.

Jean Grey then uses her telekinesis to lift up several boulders before throwing them at Black.

The rocks flies up and they struck Black Goku in the face, causing him to scream in pain.

Angered, Black Goku questions Jean Grey.

Black: Do you want me to destroy you that badly?

Jean said to him.

Jean Grey: Be warned, you are facing a being far out of your league.

Black Goku teleports in front of Jean Grey, causing her to widen her eyes in horror.

Jean Grey: What?

Black Goku throws a punch right into Jean's face, sending her crashing back.

Jean Grey screams as she was sent crashing through several buildings.

Black Goku smirks and he said to her.

Black: Know your place worm.

However, to his horror, the rocks suddenly exploded.

KABOOM!!!!

Black Goku backs off as Jean Grey flies up, her body engulfed in a red blazing energy.

Zamasu widens his eyes in horror and he questions.

Zamasu: Impossible! Just....what is that power?!

Jean Grey laughs and she said.

Jean Grey: You fools shall suffer the wrath of the Phoenix!

Without warning, Jean Grey sped towards Black Goku, striking him hard in the stomach.

Black Goku screams out as Jean throws a powerful punch, sending him flying back.

Black Goku flies up and he fires a barrage of ki blasts at her.

However, Jean Grey dodges the attacks before throwing a powerful fire bird at Black, causing him to explode.

KABOOM!!!!

Black Goku screams in pain as he falls back.

Black Goku recovers and he clutches his stomach in pain.

Realizing that his partner is in trouble, Zamasu creates an energy saber from his hand and he flies towards Jean.

Jean Grey turns and before she could react, Zamasu slashes at her, causing her to scream in pain.

Jean Grey recovers and she dodges as Zamasu swung his energy saber at her.

Jean Grey and Zamasu began exchanging blows before Jean Grey throws a punch, knocking Zamasu back.

Zamasu flies up and he fires a barrage of ki blasts at Jean Grey.

However, Jean Grey deflects the ki blasts with her arms before using her mind to hold Zamasu.

As Zamasu struggles, Jean Grey telekinetically lifts him up and she slams him repeatly onto the ground before firing a fire blast at Zamasu, causing him to explode.

KABOOM!!!!

Trunks and Mai watches the battle in shock.

Jean Grey now has both Black and Zamasu down.

Zamasu lies on the ground, his body severly injured from Jean Grey's attack.

However, Zamasu's mouth twisted to a smile as his wounds began closing up, healing up the damage.

However, despite healing from the attack, Zamasu's body is still internally traumatized by the sheer power.

Zamasu and Black Goku flies up and Black Goku said to Zamasu.

Black: Look at you. That mortal has damaged you really bad.

Zamasu nods and he questions in horror.

Zamasu: Just what is she? She got us both in the ropes.

Black Goku said.

Black: I know. The two of us would have to work together. 

Zamasu agrees.

Zamasu: Right. There is no way I am going to let a mortal stand in our Zero Mortal plan.

Black Goku and Zamasu watches as Jean Grey flies up.

The Dark Phoenix questions.

Jean Grey: What's wrong? Had enough?

Black Goku smirks and he screams out in anger.

Jean watches silently as Black Goku unleashes a powerful pink aura before his hair flies up, switching from black to pink.

Black Goku is now a Super Saiyan Rose.

Jean Grey questions.

Jean Grey: Interesting. What is this?

Black then introduces his transformation.

Black: This is the Super Saiyan Rose. Well, what do you think? Do you like the beauty of this form?

Jean Grey got into a fighting stance as both Black Goku and Zamasu charges towards her.

As Jean Grey fires a fire bird at them, Black Goku dodges and he summons an energy saber before swinging it at Jean.

Jean Grey screams in pain as Black Goku slashes at her repeatly.

Black raises up a leg and he poses as the attack cause Jean Grey to go off in a massive explosion.

KABOOM!!!!!

Black Goku smirks and he said.

Black: Now you will feel the fury of a God!

However, all of a sudden, something struck Black Goku by the back, causing him to scream in pain.

Zamasu widens his eyes in horror as Jean Grey flies up.

Horrified, Zamasu exclaims.

Zamasu: Impossible! You're dead!

Jean Grey replied.

Jean Grey: Wrong. The Phoenix can never be destroyed.

Zamasu growls and he launches himself forward.

As Zamasu throws a punch, Jean Grey throws a kick, striking Zamasu in the stomach.

Jean Grey attacks Zamasu with a series of kicks and punches before throwing an uppercut, sending Zamasu flying backwards.

Zamasu recovers and he fires a ki blast at Jean.

However, Jean Grey uses her telekinesis to block the attack before flying up.

Jean throws out a hand and she touches Zamasu in the eye brow.

As Zamasu felt her touch, all of a sudden, Zamasu felt a stinging sharp pain in his mind, causing him to scream and clutch his head.

Jean Grey smirks as she unleashes a powerful explosive wave, causing Zamasu to explode.

KABOOM!!!!

Jean Grey looks down as Zamasu crashes onto the ground.

Meanwhile, Black Goku grunts in pain and he questions.

Black: Impossible! After all I did to Goku's body....hgn....how could I lose like this?!

Zamasu pushes himself up and he flies towards Black Goku.

Black Goku stood up and the two began flying into the air.

Jean Grey watches as Black compliments her.

Black Goku: Not bad.

Zamasu said to her scornfully.

Zamasu: You pathetic mortals shall feel our wrath.

Black Goku and Zamasu each removes one Potara Earring from each of their ears. With Black keeping his earring on his right ear while Zamasu kept his on his left.

With the Potara Earrings struck onto different ears, the Potaras began glowing brightly and both Black and Zamasu began flying towards each other.

Black and Zamasu rotates around each other before the two began glowing brightly as the two fuses.

Jean Grey watches in awe as the light fades, a tall muscular green humanoid bursts out of the light.

Both Trunks and Mai widens their eyes in shock.

Trunks: No way! It can't be!

The fusion is not only taller but he has the appearance of Zamasu except his hair resembles that of Black Goku in his Super Saiyan Rose form along with a bang on the left side that represents Zamasu's mohawk.

He is also cladded in Zamasu's Supreme Kai robe except it is black.

He is neither Black nor Zamasu, he is Merged Zamasu, the true God!

Merged Zamasu opens his eyes and he smirks at Jean Grey.

Jean Grey growls and she flies up.

However, Merged Zamasu began conjuring a giant dark avian projection before unleashing a hail of lightning.

Jean Grey screams as the lightning struck her.

As Jean Grey crashes onto the ground, Merged Zamasu sneers in delight.

However, Jean Grey suddenly screams out in rage as she unleashes an explosive wave.

Merged Zamasu widens his eyes in horror as Jean Grey flies towards him at super speed before slamming right into his chest.

Zamasu screams in agony as the sheer power of the Phoenix Force began causing his entire body to explode.

KABOOM!!!!

Jean Grey flies back and she hovers in the air as she watches Merged Zamasu crashes onto the ground.

Merged Zamasu blinks in shock and pain as he felt half of his fave melting away.

Jean notices that half of Zamasu's face has turned into a purple mishapened clay and she spoke

Jean Grey: Interesting. What has happened to you?

Jean Grey looks down as Trunks suddenly exclaims.

Trunks: I think I got it! Zamasu is immortal, but Black is not. The imperfect fusion of a God and mortal must have been causing the imperfection his body.

Jean widens her eyes and she said.

Jean Grey: Oh really? Well I guess that makes it easy for the Phoenix huh?

Merged Zamasu growls and he launches himself forward.

Jean Grey screams in pain as Merged Zamasu throws a punch, sending her tumbling back.

Merged Zamasu raises up his hand and his arm began convulving and contrasting.

Jean Grey pushes herself up and her eyes widens in horror as Merged Zamasu's sleeve bursts open, revealing a huge blobbish purple arm.

Merged Zamasu slams his fist onto the ground and he said to Jean.

Merged Zamasu: Foolish mortal. There is no way you can stop divine justice!

Merged Zamasu launches himself forward and he throws a punch.

Jean Grey morphs into a fire bird and she slams into Merged Zamasu, blasting him back.

Merged Zamasu jumps up and he began growing.

Jean looks up and she gasps in shock as Merged Zamasu grew several times larger than before.

As Merged Zamasu completes his growth, he loudly declares.

Merged Zamasu: And all shall bow under the heel....of Zamasu!

Jean Grey: I don't think so!

Jean Grey flies up and she throws a flurry of punches at Merged Zamasu, forcing him to block

Merged Zamasu swung his arm, smacking Jean Grey back before firing a powerful supernova at her.

However, Jean Grey's body suddenly envelops into a gigantic blazing Phoenix, causing everyone to scream in terror.

Merged Zamasu: What?!

Merged Zamasu exclaims in shock as the Phoenix opens it's beak, swallowing the supernova whole.

Mai screams in fear and she questions.

Mai: What....is that?!

Trunks stares at the Phoenix in awe and fear and he said.

Trunks: Such power.

Not willing to surrender, Merged Zamasu growls and he shouts.

Merged Zamasu: That transformation....is no match....for a God!

Merged Zamasu fires a powerful ki blast at the Phoenix.

However, Jean Grey screams as she unleashes a powerful explosive wave.

The shockwave pushes back the ki blast, causing Merged Zamasu to widen his eyes in shock.

Merged Zamasu screams out in protest.

Merged Zamasu: No! This....can't be!!!!

Merged Zamasu screams in agony as the flames consumes him entirely, causing a massive explosion.

KABOOM!!!!

The Phoenix flies down and it watches the fire burning in the distance.

Trunks and Mai cheers out in happiness.

Trunks: Alright! You did it!

Mai thanked Jean Grey.

Mai: Thank you stranger for saving us.

However, as the bird reverts back into Jean, Jean said to them.

Jean Grey: It's not over yet.

At first, Trunks and Mai raises an eye brow in confusion.

Suddenly, a red beam suddenly bursts out of the rubble and it struck the sky.

Trunks, Mai and the girl watches in terror as the red evil energy began filling the air.

To their horror, the red energy transforms into dark projections of Zamasu's face and all of them are emitting a chilling maniacal laughter.

Zamasu began spreading across the Multiverse, corrupting every single planet with his evil.

Zamasu is destiny, Zamasu is the universe, Zamasu is limitless.

Zamasu is now Infinite Zamasu!

Zamasu opens his jaw and he fires a powerful red energy blast at Jean.

Jean Grey screams in agony as the red energy beam struck her.

Trunks quickly uses his ki to form a shield, shielding Mai, the girl and himself from Zamasu's onslaught.

The red beams strikes ever area, building, people, animal and lifeform, erasing everything from existance.

KABOOM!!!!

explosions rings across the Multiverse as Zamasu completes his Zero Mortal plan.

As the entire world became a barren wasteland, Zamasu emits a maniacal laughter.

Trunks, Mai and the girl widens their eyes in shock at the sight around them.

Everything is gone.

Trunks jaws dropped as he stares at the emptiness, flabbergasted.

Trunks: It can't be! They're gone! Everyone's gone!

Unable to handle to cruel truth, Mai cries out in anger and she loads up her shotgun before opening fire onto Zamasu's face.

Mai sobs out in anger as she protests.

Mai: NO!!! THEY CAN'T BE DEAD!!!! DIE! DIE!

Mai continues to shoot Zamasu until her gun runs out of ammo.

As Mai broke down in tears, Trunks hugs her as tears ran down his eyes.

However, all is not lost.

Just when everything is hopeless, all of a sudden, something bursts out from afar, causing Trunks, Mai and the girl to look.

The trio widens their eyes in amazement as a familiar figure steps towards them.

Jean Grey is still alive! And angrier than ever!

Jean instructs Trunks.

Jean Grey: Get those two out of this timeline now!

Trunks nods and he said.

Trunks: Right!

Trunks began helping Mai and the girl into the Time Machine as Jean Grey transforms into the Dark Phoenix.

Angered at the erasure of everything, Jean Grey said to Zamasu.

Jean Grey: A God that cares only about himself, don't deserve to live.

Jean Grey screams out in anger as she unleashes a powerful explosive wave, consuming the entire universe.

Trunks activates the Time Machine and the Time Machine teleports away just as Jean unleashes her full power.

The Zamasu projections widens their eyes in surprise and they screams in pain as the Phoenix Force began destroying them.

Zamasu screams out in anger and pain as the entire universe brightens before it went off in a multiversal explosion.

KABOOM!!!!!

Jean Grey opens her eyes as she found herself floating in an empty void.

Jean Grey said to herself.

Jean Grey: Looks like my work here is done. Better go find those three survivors.

With that, Jean Grey teleports herself towards Trunks location.

KO!

The winner is

Jean Grey

Advantages and disadvantages

Merged Zamasu

Physically stronger

Better Martial Arts Skills

Weaker

Not a strategist

Black Goku and Zamasu are unable to beat Jean Grey individually

Infinite Zamasu can be erased by reality warpers like the Phoenix Force

Jean Grey

Smarter

Faster

More powerful

Able to overpower Black Goku and Zamasu individually

Immortality kept her alive

The Phoenix Force is more powerful than Zeno who could erase Zamasu

Physically weaker

Victory quote

Jean Grey: Nothing can stop the power of the Phoenix

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