Magic Dagger

Magic Dagger is a golden dagger dropped by Mimics. It is a magic weapon that can be thrown as many times as the user wishes (until out of mana) without having to worry about running out. Daggers thrown have a creamy yellowish glow, and follow the same physics as regular Throwing Knives. They can be used as temporary glowstick-like light sources.

Trivia
It may be a reference to the many Castlevania games, where a magic dagger can be found and used until the player is out of hearts. Unlike the tooltip, you can launch multiple magic daggers at the same time.