A fairly crude but effective weapon built by the Geldarans. They constructed it using a list of ingredients supplied to them via their "Portal" by Rodney McKay when he was their oracle. Designed to be delivered by airship, it was sufficiently powerful so that a single bomb dropped in the center of a village would destroy that village completely. The bomb's existence had surprised John Sheppard and McKay, but because it had never been tested, it had never shown up on the Ancient game console back on Atlantis.
The Game - Sheppard and McKay are taken by surprise when the dropping of the bomb is discussed.