Cursed Lands

The tactic against hard-to-kill ones is as follows: conveniently position yourself behind the enemy's back, save, and strike from behind. If it doesn't work to kill them on the first try or land a lucky hit (in case of a lucky hit, you can save), then reload the game and start over.

Well, of course I did the same; without this, completing the game is VERY difficult
I also did this: (if there are many enemies and they are all strong)
using a spell (I don't remember the name, but when you click on an area, enemies run to that spot), I lure a monster closer to me and away from its comrades. When it is close enough, I stop casting and it turns around to go back. And then: we approach from behind (aiming for the head) and save. A miss means reloading. But if you hit, no one will even notice