Storm Powered (5e Feat)
From D&D Wiki
Prerequisites: Dexterity 16 and the ability to deal lightning damage.
Your mastery of electricity allows you to use your body as a conduit. Your Dexterity score increases by 1. When you take lightning damage, you gain 1 of the following until the end of your next turn. These effects do not stack, and you can only benefit from 1 at a time.
- Your movement speed increases by 5 feet.
- Your next attack deals an additional 1d4 lightning damage.