"Corticruss? Bah, some treasure collector acting on his own no doubt. I was hoping you had connections with more authority. But I should explain...
This is the so-called false tomb of Shalaz, although I doubt that there was ever a 'true' tomb to begin with. The Levos Focus Compendium, which has a noticeable enchantment to it, was part of a sort of bait. Shalaz faked his own death and several necromancer lords, believing that Shalaz had possessed some great secret, gathered around this tomb and attempted to summon his ghost. In reality, Shalaz was lying in wait nearby, and used the artifacts placed in this tomb as part of an elaborate spell that consumed all of the necromancers and infused Shalaz with their power.
The whole ruse was probably part of his plan for world domination or some such goal. All of this took place nearly a century ago, so it's puzzling that Shalaz has only now resurfaced. What I know for sure is that his cult has been raising an army of the undead in this region. It's been going on for months. I suspect that they plan to invade the Empire...
When they call me anything at all, it's usually just something generic like 'Crypt Guardian.' But since you ask, my original name was Per-Naurius and I was created to monitor a cursed tower in the Northern Wastes containing an unstable gateway that allowed things from other worlds to enter ours. I required some support in this role, so when someone found a cheaper solution, I was moved here for 'retirement.' And because providing me with some means of communicating with anyone in the outside world would expend precious resources, I have no means of doing so, even in emergencies. So I've watched helplessly as the undead have taken over everything around these crypts. I don't even know how many are really working for Shalaz or where he is, because I am only able to observe the land around the crypts I am supposed to guard.
Take the Levos Focus Compendium to this Corticruss person if you wish. I have no use for it. You can take anything else you find here: I have banished the spirits that the graverobbers who arrived here before you stirred with their recklesness, so this whole crypt should be safe now. Just don't open any of the tombs besides this one.
But I implore you, take also Shalaz's notes to his assistant, Orm. Find someone who is in a position to actually do something about this threat and tell them what I've told you."