
Originally Posted by
mykan
I'm actually working on a web comic that deals with this very issue. In this story, I depended on the POP mini comics to guide some of the story development. There IS no Shadow Weaver since she was never in the toy line. Catra is an ultra powerful sorceress who takes control of the Etherian Horde territories when Hordak takes a portion of the Horde to Eternia to claim the powers of Grayskull. Due to the irregularities of trans-dimensional travel, and spells cast by Light Hope himself, Hordak discovers that he CANNOT return to Etheria proper. The Despondos and Eternia dimensions have to be aligned just so to be able to travel back and forth - so Hordak just happened to test the portal to and from Eternia at the right time. By the time Hordak traveled to Eternia with his Horde, set up the Eternian Fright Zone, and launched his first invasion campaign, the dimensions had fallen out of alignment. Hordak was able to return to Etheria, but it was a barren nether realm, a shadow of the world he knew. It was here that he retreated if his enemies proved too invasive. He also ventured to nether-Etheria in hopes that he could find a way to break through the dimensional veil and reach the rest of his faction.
In the meantime, Catra took control of the remnants of the Etherian Horde. Forced to grow her power exponentially through independent study and new dark arts allies, she quelled the forces of ambitious Horde governors and generals that sought to carve out power for themselves. She united the Horde territories once more, and sought to achieve what Hordak didn't - defeat the united forces of the Three Realms and conquer all of Etheria. The Etherian Horde had taken control, and mastered great influence across the planet, but the Three Realms managed to keep Etheria from becoming a totally Horde-Occupied world. Hordak himself had come very close to defeating the Three Realms, but his attention had always been split between finding a way back to Eternia and establishing Horde dominance on Etheria. Once he discovered a passageway back to Eternia, he mostly abandoned the war with the Three Realms, leaving Catra to focus on the war. Once it seemed that Hordak was not going to return - and the Etherian Horde was totally under her control, Catra hatched a plan that would undermine and tumble the power of the Three Realms. Mystacor fell first, then the Kingdom of Snows, then finally Brightmoon. With no force on Etheria great enough to stop them, the planet was ready for total Horde domination.
Adora was actually instrumental in the defeat of Brightmoon, it was her first mission outside of the Zone. With the final defeat of Brightmoon, Catra consolidated more power and positioned herself as the definitive leader of the Etherian Horde. Adora was at odds with this, as she saw this political move as abandonment of rescuing her father Hordak. The newly promoted Force Captain publicly challenged Catra, who viewed the Horde Princess as a growing threat to her rule. Thus she banished Adora from the Horde on the charge of treason, and secretly dispatched cat goblins to assassinate her.