Really hope you will fix this fast.
Kozner quest is Always available but you can't take it. better make something like ministrel where it says "come back in ..." so we can understand better when we can take it and when not.
Made my first run with War (level 61). 3 lives lost, 90+ mana potion used, 50+ health potion (and i use heal, juggernaut, rally cry and pick up every planar pendant cristal), 3 pets consumed, total time something like 40 minutes.
Better make it party open or change the level difficult.
And all the gain was 1 magma fragment.

You need 15.500 fragment (half magma and half victus) to craft an arcane artifact. if i need 15.500 runs in this map and it takes 40min each i'll spend something like 10.300 hours in this map.
The same time spent in mausoleum will let me buy the artifact from auc and leave me with at least other 500m gold (plus all drops i can find in maps). I really think this map will need some adjustement...