Echoing Bolt

You hurl three thunderous bolts. You can hurl them at one target within range or at several. Make a ranged spell attack for each ray. On a hit, the target takes 3d6 Thunder damage.

If you roll an 6 on a d6 for this spell, you can roll another d6, and add it to the damage. When you cast this spell, the maximum number of these d6s you can add to the spell’s damage equals your spellcasting ability modifier.

Using a Higher-Level Spell Slot. You create one additional bolt for each spell slot level above 3.