A new mobile suit used by A-Laws' pilots, Revive Revival and Hiling Care, the Gadessa specialized in bombardment and is more advanced than the GNX-704T Ahead. This machine actually belonged to the “GNZ Series” of mobile suits created and used exclusively by the Innovades that called themselves Innovators, and both Revive and Hiling are members of this group. The GNZ series was developed using data of Celestial Being's previous generations of Gundams that was stored in Veda, a quantum processing system seized by the leader of the Innovators, Ribbons Almark. The GNZ series started with the prototype GNZ-001 GRM Gundam, which became the basis for the Gadessa.
Weapon technology from the GN-005 Gundam Virtue was also incorporated into the Gadessa, with its main armament, the GN Mega Launcher, being developed from Virtue's GN Bazooka. To cope with this large, long-range beam cannon's high consumption of GN Particles, a large GN Condenser was built into each of Gadessa's shoulders, and this is similar to the measures adopted by the Virtue.