Pyromania (5e Feat)
From D&D Wiki
Prerequisites: The ability to cast at least one spell that deals fire damage.
You have a taste for flames. You gain the following benefits:
- When a spell you cast deal damage of any type, you can choose to deal fire damage instead.
- Whenever you cast a spell of 1st-level or higher that deals fire damage, the target catches on fire, taking 1 point of damage in each of its turns per level of the spell. A creature can end this damage by using its action to to extinguish the flames. If the spell targets more than one creature, you must choose one to be affected by this ability.
- When you reduce a creature to 0 hit points with fire damage caused by a spell that deals fire damage, you can use your bonus action to regain one spell slot with a level lower than the spell you have cast. You can't regain spell slots higher than 3rd-level, and once you use this feature, you can't use it again until you finish a short or a long rest.