Blood magic

Bend and harden blood that you can see (like a water bender but only with blood) use of the spell varies you can form simple weapons (damage is the normal weapons damage plus you casting mod)

Or use ranged ex. Use it to send spikes made of blood at your enemy. Damage is 1d8 

All blood deals necrotic damage and should you hurt yourself for the blood it deals more damage 

Ex. Stab yourself with a dagger and take 6 damage and send a spike of your blood the spike deals 1d8+6 damage 

Spell damage increases as you kill more and more people with it you gain 1d8 the more people you kill maxing out at 12d8

Spell can be used as reaction blood shield adds 4 to your ac to protect you if it's your blood (has to be self harm) add 6 to ac the bonus