Possessed Hatchet

It is a boomerang that ignores the usual boomerang rule. There is no waiting for it to come back, so you can hold the button and keep several in the air at once, and each one hunts down whatever is nearby on its own. With nothing to chase it turns around after a set distance and comes home. If you die mid-throw the hatchets hang in the air where you fell and rejoin you on respawn.

The homing always aims for the back end of a worm, which sounds like a flaw and is actually the point. Crawltipedes at the Solar Pillar take damage only on the tail, and this weapon goes for exactly that without you doing anything, so it is one of the cleanest answers to the worst enemy in the Lunar Events. It is bright enough to light its own path, and with several out at once the bleed it applies keeps refreshing itself.