Chaos Storm

This spell is from the Dark Souls spell collection.

Five pillars of churning lava and flames erupt from the ground at locations you choose within range. The pillars each occupy a 5-foot square area and are 15 feet tall. Each creature standing in a pillar must make a Dexterity saving throw. A target takes 7d8 fire damage on a failed save and is knocked prone.

Whether the target succeeds or fails, each pillar covers the floor it erupted from in lava. The lava lasts until the start of your next turn and any creature that starts its turn in the lava takes 4d8 fire damage.

The lava damages objects in the area and ignites flammable objects that aren’t being worn or carried.

At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the lava lasts for an additional round for each slot level above 7th.