How about growing as a chosen of the death gods?
Death Domain Power Infusion
You have yet to fail the god of death so far, and for that, the god will grant you a tiny bit of power.
Prerequisite: Must of the Chosen of death background to take this feat
Benefit: Gain the following benefits:
- When you cast a spell that does necrotic damage, the spell is counted as being cast at one level higher for the purposes of level depended effects up to level 9.
- Gain resistance to radiant energy.