Bob-omb

 is a mining bomb used in the Crystal Hollows.

Obtaining
Bob-ombs are dropped from placing down all Crystals in Crystal Nucleus in Crystal Hollows, in stacks of 16. The drop chance is currently unknown.

Usage
Bob-ombs are consumable items. When one is used, it throws a block of TNT in the direction the player is facing. After a short time, it explodes, destroying blocks in an 8 block radius regardless of their required. 50% of the blocks destroyed will be mined, dropping their resources. The Bob-ombs don't drop destroyed crystals. Telekinesis doesn't work on this item.

Trivia

 * They are a reference to Bob-ombs from the Mario franchise.