Tiamat's Wrath

You select two damage types from the following list. Acid, Cold, Fire, Lightning, poison. you fire off a burst of energy that you your target must make a Dex save against.  They take 2d4 of the first damage type and 2d4 of the second damage type, on a failed Dex save.  Or half damage on a successful save.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d4 of the first damage type and 1d4 of the second damage type for each slot level above 1st