Draconic Lungs (5e Feat)
From D&D Wiki
Prerequisites: You must be a dragonborn.
You've developed lung capacity and breath efficiency akin to a dragon.
- You can now use your Breath Weapon twice before you need to finish a short or long rest to use it again.
- Your Breath Weapon's area of effect is doubled (15ft. cone → 30ft. cone & 5 ft. × 30 ft. line → 5 ft. × 60ft. line).