You gain some of the power of an ash spirit. For the duration, you gain the following benefits:

Ash Strike. When you cast this spell and as a bonus action while the spell lasts, you can make a melee spell attack against a creature you can see within 10 feet of you. On a hit, the target takes 3d6 poison damage and 3d6 fire damage.

Ashen Glide. Your walking speed increases by 10 feet, and you gain a burrowing speed of 30 feet.

Volcanic Resilience. You have immunity  to fire damage.

Unending Breath. You have resistance to poison damage, you are immune to the poisoned condition, and you don’t need to breathe.