Lacerator

The Lacerator is a craftable post-Moon Lord yoyo made from Bloodstone Cores. It grants +2 life regeneration upon hitting an enemy which resets after being hit by an enemy, or after 60 seconds.

Trivia

 * The Lacerator is the only yoyo added by the Calamity Mod that does not have projectiles.
 * In previous versions of the mod, the Lacerator had been renamed to "Not Viable" after getting nerfed. However, after a buff it was changed to "Viable?", and later it was changed back to "Lacerator".
 * Additionally in previous versions of the mod, the Lacerator had an invisible aura which would rapidly damage enemies within it.
 * The second tooltip and the name change to "Not Viable" are both a reference to the yoyo being nerfed to be ineffective against The Devourer of Gods.