Domain: Sun/Anti-Undead

Effect: 

Every attack you make deals holy damage instead of other types of damage unless you choose otherwise for a specific attack.

Invocation of Sun/Anti-Undead: When you cast a daily cleric spell this battle, roll a d6. If you roll less than or equal to the escalation die, you regain the use of that daily spell after the battle.

Adventurer Feat: 

If your attack already deals holy damage, it gains the following bonus damage—adventurer tier: +1 damage; champion tier: +2 damage; epic tier: +3 damage.

Champion Feat: 

You gain a +2 bonus to all defenses against attacks by undead.

Epic Feat: 

The invocation also affects your allies' daily spells.