Kelvin Catalyst

The Kelvin Catalyst is a craftable Revengeance Mode-exclusive, Hardmode boomerang that has both rogue and melee variants. It inflicts the Frostburn debuff and multiple boomerangs can be deployed at once, with the boomerang returning to the owner after a set distance, and breaking upon contact with a solid block. Upon contact with an enemy, the boomerangs spawn eight ice stars each, which do one sixth of the boomerang's base damage, sharply home-in onto enemies, and go through tiles. If no enemies are nearby, the ice stars will shatter. There can only be up to 32 ice stars at a time.

Trivia

 * A catalyst is a substance which increases the rate of chemical reaction but is not consumed upon reacting, thus it can react repeatedly.