Bombs are a tool obtained early on in Phoenotopia and Phoenotopia Awakening. In Phoenotopia they can be found at Adar's House, in the small cave next to his house. In Phoenotopia Awakening, the Bombs are instead located inside Adar's House, which is now locked down; to get them, Gale has to get the key from Garnet so she can enter the house and find the Bombs.
When a Bomb is used, Gale will hold it over her head, and the player can have her set it down or throw it at something. It will explode a few seconds after being spawned. The Bombs' explosions are powerful and can destroy stone blocks and other barriers, but they can also hurt Gale if she gets caught in an explosion.
Bombs are required to access the Bandits' Lair, as much of the first section of the lair is filled with stone blocks that can only be destroyed by them. The Bombs are also the primary weakness of Bubbles the Sand Dragon. The player has to get him to eat a Bomb so it'll stun him and leave him open to Gale's attacks.
The Bombs are also pretty effective against the Computer Guardian, as just one Bomb can instantly destroy one of the two weak points on the floor.