Karasawa

Karasawa is a Revengeance Mode-exclusive, craftable post-Moon Lord gun. It slowly fires a light blue energy pulse that explodes into a trefoil. Both the energy pulse and the trefoil inflict the On Fire!, Confused, and the Irradiated debuffs. Each time the gun fires, it consumes five bullets instead of one.

Trivia

 * The name KARASAWA is a staple of the Armored Core series of games where it typically appears as an extremely powerful Laser Rifle. Its power is often offset by the weight of the weapon (as referenced in the tooltip) and sometimes the difficulty in acquiring it.