Suggested SLAs?
We gave the throne...
Spell-Like Abilities: At will—aid, commune, continual flame, greater dispel magic, holy smite (DC 23), imprisonment (DC 28), remove curse, remove disease, remove fear, speak with dead (DC 22), waves of fatigue, zone of truth; 3/day—empowered blade barrier (DC 25), heal (DC 25), mark of justice, waves of exhaustion; 1/day—power word stun. Caster level 20th. The save DCs are Charisma-based.
I could see empowered flame strikes and similar holy/fire combos.