Purity

I'm a pally, so nah-nah poo-poo.

Rank 1

Purity of Body: you are immune to natural diseases. Against supernatural diseases, you gain Resist 50% to damage, and +10 to saves.
My Body is a Temple: any time an unholy creature (undead, demon, etc) touches you, it suffers light retributive holy damage. To "touch" you requires touching bare skin, so it does not count if you parry or block an attack, or if armor reduces the attack's damage to zero.
Resist Temptation: you gain a bonus of +2 per rank to any save against charm or compulsion effects.