Gactimus was a religious figure with a large following among the insectoid Tritonites of the Triton Moons. Even the best religious scholars of the galaxy disagreed about who or what Gactimus was. Galactimus's teachings banned entertainment and stimulants of any kind, making the Triton Moons notorious as being "dead".
Tritonite acolytes were a common site around the galaxy, handing out free tracts on Gactimus encouraging individual enlightenment.
Behind the scenes
Gactimus was created by Jason Fry for Zygerrian Takedown. Fry confirmed Gactimus was a religious figure, and indicated that Gactimus will be further developed in The Essential Atlas. Following these mentions, The Complete Star Wars Encyclopedia erroneously interpreted Gactimus as being a moon of Triton.