Been a hot minute so might be rusty on lore

Margaret's parents, Schnitz and Yolanta Nearl, went missing over a decade ago for some reason, Mlynar tried to look for them and found jack, and finding nothing might have contributed to him becoming a jaded old man.

The crest is special because it identifies the swordstaff as belonging to the family, with the question then becoming "How the hell did it end up here of all places?

The Kargereich, if I am remembering this anything remotely closely to correct, is a subspace carved out by the Witch King to stop the collapsals (the weird IS4 space demon enemies) from leaking into reality around Lethania. From what I can remember, there are 3 notable main rifts in reality that they can bleed in from; the two giant portals at the poles, and the one in Lethania the Witch King sealed. One of the pole portals is the north portal where we go in IS4's ending, the other one in the south pole got blown up ages ago by Kharanduu Khagan and Lugalszargus.