Drain Vitality

Drain the life from your foes as if a blade in their heart. The target rolls a DC15 Con saving throw. On a fail, the target has their walk(and or flying, swimming, and climbing) speed halved for 1d4 turns. If they have any spell slots, half(rounded up) of their spell slots are taken for 1d4 turns. They then roll a DC10 Con save. On a fail, a quarter of their health is taken. On a success, they take 1d6 necrotic damage.