Bloodgamble

The Bloodknight can, in time of need gamble some of his own health away to get some blood for his other magic. He cuts himself and absorbs some of his own blood.

Tier 1:
Costs: 4 health
Casting time: 10 minutes
Effect: The knight gains 3 blood 
Target: self
Tier 2:
Costs: 6 health
Casting time: 10 minutes
Effect: The knight gains 5 blood
Target: self
Tier 3:
Costs: 12 health
Casting time: 10 minutes
Effect: The knight gains 11 blood
Target: self
Tier 4:
Costs: 12 health
Casting time: 1 action
Effect: The knight gains 10 blood
Target: self