Beenade

Beenades are a type of explosive dropped by the Queen Bee boss, which act similarly to the Grenade. Upon exploding, a swarm of Bees are released, which will follow the nearest enemy. Bees appear to stay until there are no more enemies left to attack, or they have been killed. Bees from a Beenade cannot enter water.

For some reason, Beenades count as magic damage and can trigger the Spectre Armor's healing set bonus.

Beenades are useful for taking down the Wall of Flesh because they swarm the hungries, taking them out very quickly.