Initial release!
Drink Curious Vials (not obtainable) and press 'B' while holding something fiery to breathe fire, or eat up a sword while looking up!
The Draconic Omen effect from Curious Vials stacks, and if it hits 30 minutes or more you'll no longer have a need for them to breathe fire! Instead, they become a tasty snack. Reverted by swallowing an iron sword.