Burning Rage

Your Constitution score increases by 1.

Immediately after you kill a creature, if you have already raged within the last 10 minutes, you can rage again as an interaction without using one of your rages per day.

While you are raging:

• You are immune to fire and cold damage
• You can swim in lava or magma at your normal movement speed.
• You can cast any inate spell you possess because of your race/background that does fire damage as if you weren't raging. This spell counts as one of your attacks per action.
• A creature that touches you must make a DC 16 Constitution saving throw or take 1d6 fire damage.