you ain't human you can shapeshift

you are an experiment and can regenerate 

Level 3: Prototype shift

you can meld your body into weapons 

blade: deals 1d10 slashing damage turning to 2d10 at 7th level and 3d10 at 15th level 

claws: deals 1d8 slashing damage turning to 2d8 at 7th level but has a bonus action for d6 which turns to 2d6 at 13th level

whip fist: deals 1d6 bludgeoning damage at a range of 15ft turning to 2d6 at 7th level 

tendrils: deals 1d4 bludgeoning damage turning to 2d4 at 10th level but when you attack someone they have to make a str save of 14 dc of be grappled till you next turn  

Level 3: Consume

you can consume people  

1d8 health turning to 2d8 at 7th level and 3d8 at 15th level
you can use a bonus action to shapeshift into that creature if it's a medium or large animal/human

this effect with only happen when the enemy is at really low health and they fail a con save of 15 dc

Level 7: Glide and climb

you can glide and climb

you can also climb building fast

you get a flying speed equal to walking speed but you can't suspend in the air
you also get a climbing speed equal to walking speed

you also can't take fall damage at this level 

Level 10: Hammer fist

your fist become hammers and can crush people easily

deals 1d10 bludgeoning damage turning to 2d10 at 18th level
when you attack all things in a 10ft area must roll a dex save of 13 dc on a failed roll you take full damage and get pushed 5ft
this has 5 uses

Level 10: Armor

your skin turns to armor while in this state you get
1d6 extra ac
1d8 extra hp
2d6 extra nectrotic damage
this lasts 2 rounds turning to 4 at 18th level

has 3 uses

Level 15: devastator

you can emit a big shockwave followed by tendrils pushing out of you hitting anything in a 20ft range 

3d12 necrotic damage
has 3 uses

Level 18: Shield

create shields on your body  

as a reaction you can do a dex save more than the to hit of the enemy and to reflect damage of the attack

this has 5 uses