Shadow fighter

you are a shadow fighter and you can hide in shadows without difficulty you also know a few spells.

Shadow

at 3rd level you learn how to change into the creature shadow, twice every long rest you change into the monster shadow all of your stats change except your health and attacks. Length:1 hour at 3rd level, 2 hours at 7th, how long you want at 10th.

you have flight, you can fly up to 30 feet in light or dim light, 50 feet in darkness

Vampire curse

at level 7 you enchant a weapon that on a hit restores health equal to the damage dealt (+1d4 necrotic damage)

at end of day weapons that are enchanted roll a d4: 1-2 the weapon breaks, 3 the weapon is normal, 4 the weapon keep the vampire curse 

4x every long rest 

Spell casting

at level 7 you can cast the spells absorb element, pass without trace, time stop

Teleport

at level 10 you can teleport.

as long as you are in shadows you can use them to move you somewhere with shadows.

You must be able to see where you want to go. if location is 30 feet from you you automatically go there.

roll a d8 1-3 you miss where you are trying to go and land next to a monster that is by shadows, 4-6you land 30 feet away from your chosen location, 7 you land at your location, 8 you land at your location and have advantage on your next roll.

Blend into the shadows

at level 15 you learn how to hide in shadows

if you are in light type darkness nobody can see you and you have advantage on attacks and stealth rolls

In light type dim you have advantage on stealth rolls 

in light type bright you have disadvantage on attack and stealth rolls

shadow warrior

at level 18 you can control shadows to make a wall, weapons, shield, armor, and shadow creatures

you can create shadow creature(1d8+2) once every long rest 

must succeed a DC 17 arcana check to create weapons or armor or DC 15 to make structures

You can only create 3 weapons a day

all shadow(s) created disappear once you are nocked out,  dead, or asleep