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So I am creating my on Renegade Chapter of CSM with all the new stuff coming out, and I would like to create a full backstory for them as I think it would be fun and creative. I was thinking of doing a successor chapter of the Iron Hands whos home world was lost to the Eye of Terror. However it would only work if it was a plant between Medusa and the Eye of Terror that was literally right on the fringe and was engulfed when there was a "shift" or slight expansion of the Eye. Is this even possible in the Lore? I know I could make it happen as part of the Great Rift but was hoping to have it happen somewhere during like M38 and they are just now emerging.

The Eye of Terror is (was) fairly stable as a unit, but it's also friggin' tremendously huge so its borders could easily be in flux without creating any major shifts. I'm sure the various preceding Black Crusades also came with their own pulsations of the borderlands. I'd say go for it, sounds like a good backstory.

 Formerly Wu wrote:
The Eye of Terror is (was) fairly stable as a unit, but it's also friggin' tremendously huge so its borders could easily be in flux without creating any major shifts. I'm sure the various preceding Black Crusades also came with their own pulsations of the borderlands. I'd say go for it, sounds like a good backstory.

Good idea! Maybe I'll make it during the 10th black crusade and recently emerged during the Great Rift. Thanks.

I'm 90% sure that it does have "tides" so worlds on the edge could be swallowed up or left exposed.

I think I read somewhere that there was a planet, or taskforce, or something, that had been lost due to a temporary expansion of either the Eye or the Maelstrom.

Both the Maelstrom and the Eye are just particularly large warp storms. There are plenty of cases of ordinary warp storms expanding and contracting. There are cases in which planets have returned to realspace after being stuck in the warp for centuries - indeed, the plot of the Ravenor series does involve such a world, whose matter had been "marinading in warp energy for decades". There are also countless instances of worlds that remain firmly in realspace but are totally isolated from the rest of the Imperium by storms.

Anyhow. The appearance of the Great Rift is making a lot of stuff accessible. From an article on the community page:

The opening of the Great Rift has changed the face of warp travel forever in the Imperium. For the most part, it’s for the worse – the Astronomican is occluded to vast swathes of the Imperium, and warp creatures hunt the paths between the stars with impunity. However, the shifting tides of the warp have unveiled new pathways on the fringes of the Imperium, offering the promise of new worlds to explore…

Then results of the eldar's big xxxxup was never stable. It was constantly trying to expand. It was only the necron monoliths on cadia, mostly, that kept it from expanding. If not for the hard working, practical, farsighted, civic minded necrons forseeing the eldar's colossal fall and the results the eot would have spread across the galaxy when they finally xxxxed slaanesh into existence and it tore the warp open.

The necrons likely for saw the eldar would xxxx things up somehow and with their psychic powers it would likely unleash hell from the warp, and put up their monolith on worlds around their empire to contain the results, which they did for 10,000 years.