It's possible they're in "the warp", but if they were in the True Warp they wouldn't be location bound in realspace. That's the problem with the wastes and Chaos incursions after all. Can't just pop into reality willy nilly. Need to lock down a connection of "Warp" and "realspace". This might be shunted into one of those weird non-warp realms like the shadow realm.
so you end up with a Karak that was under siege, that is full of daemons who are immortal inside the magic realm, but are disconnected from The True Warp.
if they killed all locals they might be squatters, the rats or grobi as stated. Cut off, they wish for prey and take the attack of opportunity on Mathilde and the Gang because hungry/horny. Then it's a massive dragon and they pull out unsatisfied.
if they are still sieging . . . . let me pitch a scenario to you
___________________________________________
There is a Champion looking to ascend to be a Greater Daemon of the Betrayer during The Great War. Taking on the task of claiming an entire dwarven hold personally. The Champion is able to siphon off many followers and lesser daemons from the main host, and even slides perfectly into the dwarven waystone network to shunt the entire place into the warp through the same systems that power their runes.
This Betrayal is met with a betrayal in kind when the war is turned for Order. The warp that the karak has been shunted into is not The Warp, and so The Tempter gleefully watches their proud little worm writhe in a stew of their own creation. Using the rune magic as the means to shunt the Karak to another place was great, except it left the runes on. With no reinforcements, only the lesser daemons able to be dominated by the Champion can be used indefinitely. A battle of infinite suffering between two forces. A faltered siege led by an arrogant Champion that pulled too many away from the Everchosen's forces, whittled down slowly till only the daemons are left alive. A doomed hold, that will never be relieved as "small" numbers of lesser daemons wear it down bit by bit. A crucible-battery of suffering all made as a divine empowerment for Chaos.
In the event that the Champion does eventually win, great! They eat the divine power. They get to ascend. The Karak falls, and centuries of some of the most brutal fighting are under their belt (as well as a good lesson to not betray the Betrayer nor their Everchosen.) In the event that the Karak wins. HAHAHAHA! They can't! They are stuck in a nonsense pocket realm with an intense glamor that Teclis couldn't pierce (in the aftermath of The War) so they will literally never be saved. No Elf would take the time to check, the Dwarves hate and distrust magic, and the Humans have absolutely no reason to go all the way to that gods forsaken place.
It's the Perfect Plan(tm). Absolutely nobody could stumble into it, shift a few elements, and steal all of that delicious suffering and divine power away on a practically accidental coincidence of factors. The amount of luck involved to make that heist happen is simply inconceivable.
heh
