Ammunition of Fireworks

Weapon (arrow, bolt, or firearm bullet), rare

This ammunition has a magical fuse that ignites with a hiss once it's fired. When you make a ranged attack with it, the ammunition explodes at the target's location in an impressive display of colorful fireworks, destroying the ammunition before hitting or missing the target. Each creature within 20 feet of the explosion must make a DC 15 Dexterity saving throw; the target of the attack has disadvantage on the save. On a failed save, a creature takes fire damage equal to 1d4 + 1d6 + 1d8 + 1d10 + 1d12 and is deafened for 1 minute. On a successful save, a creature takes half as much fire damage and isn't deafened.

Grand Finale. When you roll damage for the explosion, a separate firework flies off from it if you roll the same number on two of the damage dice and each time you roll the highest number on a damage die. When this happens, the firework streaks towards a different target of your choice within 40 feet of the explosion. That target must then succeed on a DC 15 Dexterity saving throw or take 1d20 fire damage.

"It's beautiful, isn't it?"
"Definitely. Once you get past the burning smell and ear-ringing, of course."