Unlike Shadows of Undrentide, Hordes of the Underdark is much harder, and offers more of a challenge for experienced players. Since the game is for character levels 15 and above, you'll be fighting the likes of dragons, demons, powerful mages, undead overlords and other vicious uber-creatures who can kill you with just one touch. The boss fights are particularly nasty, and I found myself loading my last saved game during more than one big battle trying to figure out the best way to go about winning. You can cheat a bit on some of the boss fights and by leaving the room, resting up and rememorizing your spells. When you get back, your opponent will still be at the same health level they were when you left.