[2023] Where is Amascgone.. I mean Amascut. And where is momsy.. I mean Mimsy.?? Second day I can't find/see them.. and nobody replies if I ask about those two

Icthlarin only sticks around long enough to be happy you are being a nice necromancer (and until the medium tasks are complete) - if you need to reclaim a lost Tome of Um, talk to Frank in the building north of Um's pub.

Mimsy is likely just anywhere else in Um - it has a big wander range.