tweaking Group Events....
The boss at the Frozen Maw should have more hp, deal more damage and his tornados should move around in random patterns. Also, the portals he summons should have more HP and the mobs coming from it should be veterans mixed with champions, depending on the number of players. That would make this fight a lot more interesting.
I know a lot of people wouldn’t agree with me on this, but I like a game that has a challenge, especially when there are lots of people around that help eachother.