There are plenty of weapons in The First Descendant, and one of the most powerful accessible early on is the Thunder Cage SMG—and certain Reactors give a boost through the Thunder Cage Mounting bonus.
The Thunder Cage SMG in The First Descendant is likely to be the first Ultimate Weapon you encounter in the game, as a subquest early on directs you to collect all of the required materials for crafting, and the weapon gets even better if you perfect your build.
