Your god's comprehension of arcane mysteries extends to shielding you from elemental forces.

Encounter ✦     Divine
Immediate Interrupt      Personal

Channel Divinity: You can use only one channel divinity power per encounter

Trigger: You are hit by an attack that deals acid, cold, fire, lightning, or thunder damage to you

Effect: Until the end of your next turn, you gain resist 5 to a damage type of your choice: acid, cold, fire, lightning, or thunder.
Level 11: Resist 10.
Level 21: Resist 15.

Published in Divine Power, page(s) 109.