New upgrades and the cursed human

Will flying back to the city to get repairs and upgrades to my I've been researching ways to revive dinosaur but so far the hasn't been luck in my testing experiment, all samples fail so I put it on hold.

I landed in front of my town hall and headed to mechanic section to get repairs and upgrades on himself a robot engineer spoke" boss did you get damaged again" he said while laying on a workbench "something like that but I think i got a little carried away while fighting 2 nomus" ultron said.

"Alright what do you want me to upgrade this time" he said.

"Please improve my body that is able to take spikes hm maybe something like vibranium" ultron said as he checked how much he has currently.

("Vibranium 510, costs for upgrade body 450 vibranium" )the system said will i was crying about how expensive it is but he bought it anyway and was angry at the system for overpriced body upgrades.

("Ding the host will now be entered in sleep mode until his upgrades are complete") as the system spoke I immediately feel in sleep mode for 2 weeks.

Meanwhile in musutafu city people didn't see ultron for 2 weeks so they got worried about about him and tried to search for him but no luck.

In the allys of musutafu city a man could be seen killing 2 civilian 1 hero and 4 gang members he looks up at the moon you can see he has black and red eyes filled with hate and rage with red horns.

Name: Kris 

Age: 150

Race: demihuman 

Ability: shadow walk able to walk in the shadows without being caught heard or sensed, cursed by devil lucifer while soul in contract.

Weaknesses: decapitated head or heart remove 

"I will kill everyone and any city that involved in my partners they will know what true hell looks like" kris said.

Flashback 1945 kris was having a normal day but it all changed when he was heading back home.

In the distance he saw his house on fire, he rushed to his house to see something he won't ever forget.

He see people with torches and pitchforks happy that they are about there deaths while kris was angry and his neighbors, no the humans they will all pay for what they did.

As he transformers into his demon form kill everyone in the village he feels a uncontrollable rage and hate towards the human race.

"I MUST KILL THEM EVERY LAST ONE" kris said 

"Not yet my friend" lucifer said as he appears right in front of him.

"Who are you and what do you want" kris said.

"I will give power to kill the humans in exchange you will help me in the future do we have a deal"? lucifer said as he extended his hand waiting for a response.

:Fine its a deal" he shacks his hand as the the contact been sealed.

"Remember if you tell anyone are deal is over" lucifer said as he disappeared.

Flashback ends "hm i wonder how things are going with lucifer" kris said.

"Well time keep hunting for a while" as kris runs to another alley people see dead corps oof 7 people. 

The police tried to locate the victims killer but no luck. 

The victims were all over the news of a unknown killer, the police grates detective could find him but maybe ultron can help.