Blood Funnel

Rakdos Spell
Concentration
Range: Self
While this spell is active, you may cast spells on subsequent turns without using spell slots and instead paying life equal to 10 x Spell Level. This damage cannot be prevented or reduced and it reduces your maximum hit points until you finish a short rest. After a short rest, the ability to heal all of the hit points you lost with this spell becomes available you, but they do not heal by themselves.