Cobalt Kunais are craftable consumable Hardmode daggers made from Cobalt Bars. They can pierce twice and travel a short distance before being affected by gravity. They have a 50% chance of being recovered after being thrown.
Performing a stealth strike with a Cobalt Kunai causes three homing cobalt energy bolts to be released instead, that ignore gravity and can pierce twice.
The Cobalt Kunai cannot be reforged, and therefore cannot have modifiers.