Wrath of the Storm is a Tempest Domain Cleric Passive Feature. It grants the Cleric two reactions to strike back at an attacking creature, doing Lightning damage or Thunder damage.
Description
As a reaction, strike back at an attacking creature, dealing 2d8
Lightning or 2d8
Thunder damage. The target takes half damage on a successful 
Saving throw.
How to learn
Classes:
- Class level 1: Tempest Domain Cleric