Nightmare is the second in command in the police department at Undercity ( I'm so bad at naming XD). He is a assigned to guard the world most rare diamond "the blue Ocean". It was lost during the titanic sank.

After countless years of searching; they have found it, and it is a place at the Undercity Museum guarded by hundreds of police under, Nightmare. If someone would decided to steal the diamond; he/she will be the richest person in the world, however, to do so; you have to pass the most scariest and the deadly cop you will ever seen.

Nightmare has never lost his record of catching criminals. When ever a criminal try to steal or murder they will get caught by him, and having some of broken bones.

Nightmare has this tentacles on his back and his bones are black. His eyes are cyan blue his uniform are black. Getting pass him is a death wish. Nobody has the guts to steal that diamond and get pass him.

The diamond is save and sound.

....

Or is it?

At the police department

Nightmare.pov

I am at my office doing some paperwork when suddenly there was a knock "Come in" I call out. It is one my co-worker, killer "The chief calls you" calling out from the door frame. "Alright, I will be in there" I respond and he left. I had just finished the paperwork and head straight to the chief office.

The chief the office is right next to my office as I am in, Second command. I knock at the door " Come in!" Call of by the chief as I enter his office and I say " Dream, what do you want this time now?" I frown not liking what my borther put be this boring task he has been giving me. Dream frown not liking by my tone. "Bother, we have talked this before you have to call me chief" dream gesture Nightmares to sit the opposite where he is sitting in his chair.

I roll my eyes and sit on the chair where he just waits for me to feel comfortable "dream why do you call me again" I asked again. Dream sighed ignore his brother question "Bother, i have received a call from Chairman of the Undercity Museum and the asked us to guard the treasure that says to be lost deep in the Atlantic Ocean and they wanted us to guard it; fear of being stolen and i want you to guard the lost treasure" as dream finished those sentence nightmare just his the table with his tentacle " REALLY, DREAM! YOU WANT ME TO BABYSIT AN OLD RUSTED AND BROKEN JUNK' shouting at dream not liking the task he is giving me. a dream move back little not taking Nightmare to respond " bother it not just junk it really valuable" dream try to reason with his bother knowing that his bother it tired of being used simple or boring jobs. 

Nightmare glare at him "What is so valuable about it" night cross his arms and waiting for Dream reason. "The blue Ocean diamond it has been found and you know this is the rarest in the world and this was the reason they wanted us to guard as you know that many thefts will do anything to get their hand on the diamond " Dream give nightmare straight answer and Nightmare eyes widen taken by surprise; he knows about the lost diamond and knowing the cost it would be the life time of paradise.

"Okay I will take the job" Nightmare accapt the job. "Great, you will be starting tomorrow at night and other officers that will be joining you and here some of the things you needed to know. Bother you will are in charge guarding  the diamon" Dream than past a map of the museum and important documents about the museum. Nightmare took the document " Alright, dream.  I'll be heading back, now" Nightmare side to his brother as dream noded understanding how tire his brother is " alright, brother. Rest we" Nightmare  just head out the office going straight his house.

???Pov.

"This is crazy, are you sure we can get in there" A child that as white hair and his eyes are red and purple has the shape of a target.  " relax chara this will surely work and we will get that diamond" the monochrome skeleton reassure the plan will work. " why are we steal that blue junk anyway to me it just a blue rock shape like a diamon that can be found in a dollar store" chara, grow and look away from monochrome.

monochrome skeleton sign  out of frustration" That junk can make us have endless of supplies of chocolate and we don't have to worried about the money anymore' with those word Chara only say two word "I'm in".

At the Undercity museum

Nightmare pov.

Group A you will be at the fron entries and group B you will be at the back." Nightmate is giving instration for guarding the diamond. "Keep on alert for any suspicious activity and don't slacking off. Did I make myself clear!" Nightmare grow at the if they make slack off. "Yes sir" the teams say in union. "Good, I will be at the inside where the diamon will be kept save and if something if off contact me from the walking talking" Nightmatre had tell what to be done and where he will be " yes, sir !" The team give the conformation for job given. " good, let's go" with that Nightmare and his team are set off.  Try to get past me, thief's; I'll surely enjoy your screams of your pain. Night softly laugh to himself.

At Night

Chara. Pov

This should work got "Okay, all the security camera are turn off and the door are unlocked all the doors, but you have to get pass the gourds that in guarding the back door" Chara is in a room fill will computer scream from each side and he taping some code to help the monochrome to get into it.

Cross. Pov

Cross is hidden in the shadows "No, worries I got this" Cross smirk "the plan will work".

Okay I will stop here if you guy like it then I will make a part 2. I'm not sure if this is good, but I alway wanted to write about cross being thief as nightmare being a cop

If I have a mistake some spelling please correct me and i will do the best I  can to improve writing but I do what I can to make this story better.. thank you and hope to hear you so bye.