Emerald Inferno Slash

Dealing a melee attack with this spell you may expend any number of spell slots to increase the damage of the attack by an extra 1d4 on top of the d10 damage already dealt to the target of the spell. The target of the spell must succeed a dex saving throw to take half damage. The attack also extends into 5ft wide 15ft long line of green fire.

This spell’s damage increases when you reach certain levels. At 5th level, the melee attack deals an extra 1d8 fire damage to the target on a hit, and the fire damage to the second creature increases to 1d10 + your spellcasting ability modifier. Both damage rolls increase by 1d8 at 11th level (2d8 and 2d8) and 17th level (3d8 and 3d8).