Pyroclastic Cannon
Pyroclastic Cannon
Tier 3 Epic evocation
Casting Time: 1 action
Range: Self (500-foot line)
Components: V, S, M (liquid magma from the heart of a volcano)
Duration: Instantaneous
A column of pure lava erupts from your outstretched hand in a direction you choose, forming a line 500 feet long and 15 feet wide. Everything in the line must succeed on a Dexterity saving throw or take 50d8 fire damage and be coated in molten lava for 1 minute. A successful saving throw prevents being coated in lava. A creature coated in lava takes 10d8 fire damage at the start of each of its turns and can attempt a Dexterity saving throw at the end of each of its turns to end the effect.
Ref: ELCR p102