Eye of Terror
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The largest gateway from the Warp to the Materium, caused by the birth of Slaanesh, due to the entire Eldar race deciding to partake in a mass orgy of galatical proportions (In layman's terms: They fucked so much they created a massive hole in the very fabric of space and time. Yes it is as hot retarded as it sounds.) The area of the Eye of Terror used to be the area where the old Eldar planets used to be but now they're fucked beyond comprehension after the Birth of Slaanesh so the rest of the Eldar are living on Craftworlds or faraway planets....well except for the BDSM addicted spehss elves who are living inside the webway. Currently home to the traitor legions, most of the surviving primarchs and some unlucky Eldar who still live despite the fall.
Inside the Eye of Terror, nearly all is subject to the nutty whims of the Chaos Gods and their daemons. End result is that the Chaos Space Marines can always retreat back to it and mock the Imperium saying "Nah nah, you can't get us," to which the Imperium always replies "If we could then we would've slaughtered all of you heretics long ago," and the traitors have of mixed response of "No you wouldn't" and "Yes you would've, but you can't, so haha." Despite it being a endless tear of raw chaos power in the very fabric of physical creation, home to some of the most powerful and brutal warriors in the setting, it still does not deter or even frighten the Balls-of-Steel Imperial Guardsmen. This is likely the result of Creed's tactical skill.
Cadian Gate
Y'know how in those war movies, there's that one part where the soldiers are all hanging out before the shit hits the fan and they're pressed into service? That's kinda what the Cadian gate is like to the Eye of Terror. Named after the planet nearest to it, the Cadian Gate is the most stable region around the Eye of Terror owing to the fact that large, strange artifacts of ancient alien design are found all over the Cadia and even neighbouring planets. Because of its location in the Eye and because it's the only place not constantly fucked with warp storms, Cadia and indeed the entire Cadian gate is an enormous flash wherein the Chaos Legions raid the Imperium from their Daemon worlds, the biggest of which happen during the Black Crusades.
Black Crusades
There have been 13 of them in total led by a certain armless failure. Despite his title and the jeering of /tg/ or the retconning of GW, the last black crusade managed to really fuck things up - not just for the Imperium, but for EVERY SINGLE FACTION INVOLVED! Chaos Legions splintered and broke off, Guard regiments and Space Marine chapters turned renegade, warp storms swept the area, Orks are WAAAAGH-ing all over the place (most often against themselves), Tyrannid feeding frenzies and other crazy shit. Serious! Check the numbers from the Eye of Terror campaign and the disorder forces actually won it. Cadia itself got massively fucked up.