Ideas for Black Magic Gems

A few ideas

---Black magic aura
Disease Aura: req. lvl 5 black magic, increases minimun damage of spells and weapons by 2
Plague Aura: req. lvl 10 black magic, increases minimun damage of spells and weapons by 4
and so on

---Drain over time
Drain Blood: req lvl 3 black magic, deals 1 damage and heals 1 hp every 11 seconds, costs 2 energy
Drain Life: req lvl 11 black magic, deals 2 damage and heals 2 hp every 11 seconds, costs 4 energy

---Live convertion
Dark Ritual: req lvl 9 black magic, converts 15 hp into 30 energy
Unholy Ritual: req lvl 17 black magic, converts 30 hp into 60 energy