A/N:here is the next chapter you all been waiting for please all of you enjoy also play the song above  if you want.
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(Previously)

As Wales and Illustrious immediately turned around as there eyes widen at who they saw.

????:my name is Observer Zero and prepare to be destroyed.

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(Continuation)

With Y/N and the others we could see them having there mouth wide open and jaw drop to the floor and look of disbelief.

Cleveland was the first to snap out of her trance state and return back to normal.

Cleveland:no way your making them fight Observer Zero an adviser to the Arbiter?

Cleveland ask as she turn to look at Y/N who has a wide grin on his face.

Y/N:well of course I would.

Y/N said as the others have mannage to snap out of there trance state.

Yorktown:then why choose Observer Zero?

Yorktown asked wondering why he made them fight and Advisor Class Siren.

Which is a rank that is only go Observer Zero, Alpha, Purifier , and Tester.

Y/N:well by making them fight one of the Advisor Sirens we could see how strong they have become.

Y/N said which he was right they haven't even fought a Humanoid Siren let alone a Advisor Class Siren.

And if you think about it Y/N only had them fight Siren production model ranging low to high class ships.

This is something they have wondered but they all realized that they were being tested by Y/N.

He wouldn't give such retrofit to them unless they are consumed by there own greed to want more power.

And yet they didn't as they were lucky they didn't become greedy for power and they wouldn't imagine if they have become one.

It would make there Elder brother disappointed and even possibly leave them like what he did 2 years ago.

This made the girls pale including Enterprise she doesn't to lose him again so they would do anything not to make him disappointed in them.

And they should learn how to control the power they are holding right now.

All of them were inexperienced so by letting the others fight some production model ships.

They could easily know how to use the new weapons and it's function.

Since the Royal Navy was the was third on going to the one  simulation room.

They would have known by now on how to use there weapons.

Denver:why can't we fight some Humanoid Siren Big Brother?

Columbia: yeah can we big brother?

The four of them along with Hornet and Warspite then beg Y/N to let them fight Humanoid Sirens.

Y/N:very well.

Y/N said as he made another door open that leads to another simulation room.

Y/N:enjoy your test on the simulation girls.

Y/N said while waving his hand at them as the girls went to the other simulation room.

Leaving only Yorktown and Enterprise with him.

Meanwhile back at Wales and Illustrious we could see them aiming there weapons on OZ.

(A/N:OZ means Observer Alpha for short.)

OZ:guess I'm going to be the first one to make the move then.

OZ said as 12 Humanoid Sirens appeared behind her

OZ:now then let's have some fun.

OZ said with a smirk on her face as the humanoid Sirens all lunge towards the two Royal Navy ships.

Wales:Illustrious you handle Observer Zero I'll take care of the Humanoid Sirens.

Wales said as she aimed her cannons towards a HS.

Illustrious:Roger that Wales.

Illustrious said as she made her Holy Requiem transform into her spear form.

Wales then lunge to a nearby HS as she activate her Flein Field.

With Illustrious we could see her aiming her weapon towards OZ who is looking at her in a bored expression

OZ:oh attacking me how pathetic of yo-.

OZ mocked but was cut of as she was hit by a missile to the face sending her into a nearby iceberg.

Illustrious:you should let your guard down.

Illustrious said as she raised her spear to block an attack from a HS.

Before firing one of her cannons towards the HS immediately disintegrating the Siren.

A barrage of blue beams came from were OZ was.

As Illustrious activated her Klein Field immediately blocking the beam from hurting her.

OZ: I'm going to rip you to pieces you piece of trash.

OZ said as she came out of the iceberg with an angry look on her face.

As she fired torpedoes towards Illustrious who jump away from the iceberg she was standin on.

As she dodge the incoming torpedoes and look to see OZ holding a rapier.

OZ: I have got you now.

OZ said as she aim to pierce Illustrious heart but only for it to be back by Illustrious.

Who used her Holy Requiem to block the rapier and absorb it immidietly.

OZ saw this as she let it go seeing that she can't attack her on close-combat.

She gritted her teeth before aiming her guns at Illustrious before firing.

The beam went straight to Illustrious as her Klein Field blocked it.

As the beam bounce off of illustrious before she then fired her cannons on OZ.

Black beams went straight to OZ as she saw this she immediately flew above.

And instead the beam hit a nearby iceberg melting it.

Making smoke that covers illustrious view seeing she couldn't see due to the smoke.

She put her guard up and quietly looked around until she heard something heading behind her.

She turn around and block an attack as she fired back.

OZ:Gaaaaaahhh!!!

Her attack bit OZ but she couldn't confirm if it has hit her fully.

She flew up above to see things clearly and she saw one OZ torpedo pods  destroyed.

OZ noticed Illustrious appearing above her as she glare at her.

Before making portals appeared behind her.

As Siren Interceptors flew out of it and went straight to Illustrious.

Illustrious saw this as she launched several SF-118 COSMORHINO.

As her planes intercepted OZ interceptors.

OZ:I got you now.

OZ said as she appeared behind Illustrious before kicking her.

As Illustrious was sent straight crashing to an Iceberg.

Illustrious crash to the iceberg but was still fine thanks to her Klein Field still at 100%.

As she stands up she saw OZ firing a barrage of towards her.

OZ:time to die trash.

OZ said as she fired a barrage of beam towards Illustrious.

Who didn't have time to react as the beam hit her.

*Boom*

Large smoke was surrounds Illustrious as OZ had a smirk on her face knowing she has already defeated Illustrious.

*Boom*

Or so she thought a missile hit her from behind damaging one of her turrets.

OZ: Gaaah!!!

OZ screamed in pain as she turns around and look to see Illustrious 50 meters behind her.

OZ:what how did you get there you should have died by my attack.

OZ said in shock wondering how Illustrious appeared behind her.

Not knowing that illustrious used a mirror ring field as a portal to appear behind her.

Illustrious: you say we are obsolete but it would seems you the one who is the obsolete one you squid.

Illustrious said but chuckling at the last part knowing it made OZ angry as judging by the reaction on her face she is currently have.

OZ:how are you I'm not a squid.

OZ angrily shouted as she lunge at Illustrious preparing go fire another Barrage of beams toward her.

But only for her to get hit by a missile on her left side.

*Boom*

OZ screamed in pain as she look to her left and see Wales firing another missile at her.

Wales:not on my watch.

Wales said as she moved to the side dodging an attack from the 2 remaining HZ.

OZ:another pest.

OZ insulted as more portals appeared behind her and 50 HS came out and went towards Wales.

Wales:Illustrious destroy OZ she's the source of summoning this HS.

Wales shouted to illustrious as she slice two HS in half.

Before firing corrosive torpedoes towards 5 HS as it shred the Siren to pieces.

Illustrious: I'm on it Wales.

Illustrious said as she activate her Super Gravity Ring Cannon.

Making them appear behind her as she then launch 200 SF-118 COSMORHINO.

Using it to distract OZ who is preparing to fired another wave of salvo towards her.

OZ saw the incoming fighter planes towards her as she flew above.

And the Planes followed her while she try to destroy the Planes that are following her.

OZ:damn you obsolete ships.

OZ cursed before firing another Barrage of beam on the fighter planes.

Who are dodging her attacks before firing back at her.

As she flew to different directions to dodge the barrage of laser bullets.

A interceptor appeared infront of her firing a Thunder Missile.

OZ saw this as she flew below dodging the missile.

OZ:Hahaha you will never hurt me with those slow missile of yours.

OZ said but the missile she dodge exploded above her as black thunders appeared out of the smoke and strike her.

Making OZ screamed in agony as her whole body is electrocuted by 50 thousands megawatts of power.

OZ then fell to the ice as she smack on it breaking her right elbow.

As she screams in agony as she try to stand up and hold her right arm.

OZ spit out yellow blood from her mouth as she flew to a nearby cave to hide from the interceptors.

OZ:damn that obsolete ship.

OZ cursed as she sat on the ice walls and look outside to see the Interceptors flying around as she rested for a bit.

But then heard the sounds of something moving bellow.

OZ look down below her and see some glowing lights until her eye widen at what is heading towards her.

OZ: torpedoes!!!

OZ Said as she flew outside and the cave she was hiding in exploded as a small blackhole shredded anything near it.

Before explodding making nearby iceberg melt from the intense heat the blast created.

Illustrious: find you.

Illustrious said as she appeared 80 meters above OZ as she fired her gravity cannons towards OZ.

OZ saw this as she was about to dodge it when several blue missiles hit her.

As the missiles exploded she was covered in ice only her head wasn't frozen.

She looked up towards Illustrious before saying her last words.

OZ:curse you, you obselete shipdl my sister's will avenge me!!!

OZ last thing said as Illustrious fired as she used only 1% of the Super Gravity Ring Cannon power.

As it went toward OZ immediately disintegrating her as she screams in agony.

OZ:Aaaaaaaaaahhh!!

*Booooooommmmmm*

A massive explosion equal to 5 Tsar bombs as Illustrious was protected by her Flein Field

Illustrious:it has finally ended now only need to help Wales.

Illustrious said as she flew towards were Wales is leaving the burned sea infront of her.

Meanwhile 120 miles away from them, Wales was fighting away from Illustrious and OZ as the two flew away a few minutes ago and fought somewhere.

She is currently slicing a torpedo that was going to hit her.

As the torpedo split in half before being absorbed by Wales Saber.

Only 12 more HS are left as she then fired a corrosive missile towards two HS.

As the missiles hit the 2 HS making two small blackhole appeared and fuse together making a more bigger blackhole.

As it shred the two HS before explodding as it kill 4 HS that were near the other two.

Suddenly an HS appeared behind Wales holding a laser spear.

HS1: I got you know time for you to die.

The HS said as she strikes Wales withe spear as Wales hasn't had time to react and couldn't block it with her sword.

But then 3 SF-118 COSMORHINO appeared above and fired a barrage of laser bullets on the HS Siren shredding it to pieces.

Illustrious: are you alright Wales?

Illustrious asked as she appeared 12 meters above Wales as she lands infront if Wales.

Wales:thank god you have arrive in time Illustrious and yes I am fine.

Wales said as she hug Illustrious before separating.

Illustrious:it's good to see you to wats how about we handle the remaining HS first then?

Wales:I'm glad you asked.

Wales said as the two of them lunge at the remaining HS who are by now shivering in fear as they hug each other.

Meanwhile with Y/N we could see him smiling above as he see there performance quite well.

Yorktown: Illustrious mannage to defeat Observer Zero.

Yorktown said in shock even though this is a simulation the one Illustrious defeated was 3 times more powerful than the original Observer Zero.

Y/N:you would be all surprised of I told you that the one Illustrious defeated is 3x more powerful than the real Obsever Zero.

Y/N said as he switch the image and it now showed Hood and Queen Elizabeth this time.

While with Yorktown and Enterprise on the other the sentence alone made them have there jaws dropped to the ground as they look at Y/N in disbelief and there eyes looks like it was about to pop out of there eye sockets.

Yorktown/Enterprise:.........
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..........Naaaaniiiiiii!!!!!!!!

To Be Continued
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A/N:hey this is the end of the chapter and everyone I got good news the story has mannage to reach over 40k views now and the special chapter will be released later that's all Author Out.