Everything up to Bonemass is relatively fine, with Bonemass being the first real hurdle. This is mainly because of the assassins. However, immediately after Bonemass I felt like a god. Just face roll my way through the game. I did not enchant anything until after Moder and used iron-tier gear well into the plains, yet I had no issues with anything (except poison dots, but this is class dependent). While it is fun to feel immortal, the novelty wears off quickly when I can jump into the middle of fuling villages and facetank everything or solo 7 Moder's at once.
Demigods mod may be enabling this type of gameplay. However, this mod is also incredibly fun. To the point where I'd consider it one of the best mods on the list (Not that the others are bad, there's plenty of great and impactful mods in the pack). So I would like to see this mod stay, but I could understand it getting nerfed or removed altogether.
So how can we increase the difficulty while keeping the fun things intact and promoting meaningful gameplay?
I propose some buffs across the board to a few things. Initially, TTK increased. Mild buffs to enemy hp (excluding bosses) per *. This change is more of a scaling buff to later mobs. This change should be felt the most when taking on multiple mobs, as the extra hit or two it may take to kill something will add up. This should promote a more strategic approach to handling groups of enemies while slightly reigning in on dps'ing your way out of what should be an undesirable engagement.