Type: Metamagic
Source: Dragon #303
Your magic is so steeped in the powers of death that your other spells become partially infused with necromantic energy.
Prerequisite: Spell Focus (Necromancy), any other metamagic feat
Benefit: Whenever you cast a spell with an energy descriptor that causes damage, half of the damage resulting from that spell is caused by negative energy and the other half of the damage is caused by the spell's normal energy descriptor. A tainted spell uses up a spell slot one level higher than the spell's actual level.