The Wasp Queen Trinket is a tier 3 Trinket, obtained as a 1% chance drop or a 1/25 chance from stealing from the Wasp Queen boss. When equipped, its effect is giving a 30% chance for all bows/crossbows to not use up an arrow shot, effectively reusing it.
If using basic arrows such as Arrows, Feather Arrows, or Splinter Arrows, it can slowly duplicate them overtime if all shot arrows are retrieved.