Master Spark (5e Spell)
From D&D Wiki
|Casting time:||1 action|
|Range:||Self (90-foot line)|
|Components:||V, S, M (a faceted diamond worth at least 100 gp)|
Bringing your hands together, palms forward, you fire a white, rainbow-tinged beam of light and heat energy from your hands that is 90 feet long and 5 feet wide. Each creature caught in the spell's area must make a Constitution saving throw. A creature takes 3d6 fire damage and 3d6 radiant damage and is blinded until the start of your next turn on a failed save, or takes half as much damage and isn't blinded on a successful one.
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, either the fire damage or the radiant damage (your choice, but only one) increases by 1d6 for each slot level above 3rd.