Something I've noticed(not pertaining to the most but the game itself) is that they've had problems where after a random time you cannot play the game(stuck after Endless Abyss screen). Again, this is the game, not the mod's error. Just curious to know if any of the modders(or you) can fix it?
As for the obsidian thing, I would guess that would be difficult. it's also not very necessary. Poison and curse cards are the only things that can damage you except events.