Gomgo is essentially Mongo from Flash Gordon, A Warlord Named Gim the Merciless is well on his way to dominating the world, resisted only by a handful of princes who squabble amongst each other.
The technology is solidly 1889 withsome weird additions, Cavorite being notable among them.
Gim leads his Legions of Terror, a tough and competent military force, who are fanatically loyal. Their uniforms resemble what you might expect from an Evil Marching Band
Harald's Group makes contact with Prince Falfr who is a resistance leader against Gim.
1/5 Prince Falfr thinks they're native to Gomgo, has no clue about the gate.
The Soombar explorers go to Gomgo
4, 1 they wind up over sharing and are captured by Gim the merciless who begins his own Fringeworthy program.
Gomgo is on the Stellar Platform of C -22, Barbarians of Lemuria