Im running both Calamity and Thorium, however a blood chamber to fight viscount will not spawn. Although the Grim pointer still points towards a point underground rather than the top left if a blood chamber doesn't exist. Anyone else got this problem?
I've been having the exact same problem, tried generating multiple other worlds and the problem still persists.
Have either of you checked the full map via tEdit or other means? My grim pointer sent me to a random area of the underground that wasn't the blood chamber, but upon viewing the full map I found that I did have a Blood Chamber a good distance below where the pointer was sending me.