Erebus

You fire a jet of lava at a target. Make a ranged spell attack roll; on a hit, the target takes 4d8 fire damage and becomes covered in lava, having to make a Constitution saving throw. On a failure, it becomes Weakened and Scorched, taking 1d8 fire damage per turn.

At Higher Levels. When you cast this spell by spending Mana points equal to a 4th-level spell or higher, the fire damage increases by 1d8 for each spell level above 3rd. At 5th level, the fire damage becomes incinerating.