For your consideration (current playing Windows Alpha 2.7.0 version).
With the change to a non-linear dungeon the old moral system doesn't work very well and is probably in need of an overhaul. Currently you can quite easily end up with zero moral just by walking around even before encountering any fights, especial early on with low difficult dungeons.
As a starting point I would suggest something like, for each new dungeon room you encounter cost 1 moral and for each fight encounter cost 8 moral (with curios coming back give them something in-between say 4 moral). In addition this can also be scaled against the dungeon difficult, so novice dungeons would be 1/4/8 moral; adept dungeons would be 2/6/12, veteran 3/8/16 and elite 4/10/20. (May also need to tweak the starting/base amount of moral and bonus moral from barracks/items.)
Alternatively more in line with the old system, you could only lose moral (think it used to be a base of 10) when you encounter a fight (and with curios coming back give them a smaller cost say 5), empty rooms would not cost you any moral.
Or you could take a completely different approach, and start with a large moral value (say 100+) and every step you take in the dungeon costs you 1 moral, (obviously this would also mean extra work having to update items/bonuses in line with the new moral scale).
P.S. Although better, still getting noticeable lag/freezing when casting Holy Bolt.