Challenging but repetitive. The only real endgame activity I can think of is hunting the 10 dragons (base game, DLC brought in more endgame I believe.) they are all challenging and drop amazing loot, but for the most part they are fought the same way. You just have to watch out for the variables and the terrain. For instance, 1 Dragon might periodically give itself a layer of armor that you have to destroy before damaging it. Another might summon dragonlings to distract you at half Health. 1 might use lightning instead of fire, and will electrocute pools of water below you that can quickly kill your teammates if you aren't careful.

I see. Is the multiplayer community still active? Is it fun? Amusing that RPGs won goty last year and this won in 2014