Atoms True Blessing

A faint green radiant sigil is shown of your chest, if a person casts detect magic they can feel the warmth from the sigil.

You can level up this feet my doing specific things in game, the DM knows what these are 

Level 1: whenever under half health, a green glow emanates from you of 20 feet dim light, on top of that. (when you make an attack and hit, heal 1d4 hp)(if attacked, hit, they take 1 necrotic damage and miss they take 2 necrotic damage)

Level 2: Once per short rest, When hit by an attack you can have all enemies within 10 feet make a Con saving throw of (DC 8 + CHA modifier + proficiency) or take 2d8 necrotic damage and be blinded until your next turn

Level 3: Once per long rest, when you reach 0 hp, all enemies within 10 feet take 4d6 necrotic damage and you go back to quarter hp

Level 4: you can enter ghoul form for a max of 4 turns, while in this form( Gain resistance to all damage types except force and psychic)(Melee attacks deal an extra 2d6 necrotic damage)(while in this form you take 2d4 radiant damage at the end of your turns which is not halved by your resistances)(based on the radiant damage you take, add that to your next roll to hit)