I remember doing Aetheon hard as a level 28, Skolas as a 34 is still harder for me because of all those objectives you have to juggle with DPS'ing Skolas and keeping the taint moving and disabling the mines.
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Not really... I mean, skolas pretty much hides from Ya, there are a set amount of adds that spawn at certain health increments, the mines spawn at what, 50% and 20-25%? The taint is easy to juggle since it literally rotates between players. It's a very predictable fight. The only way I see it harder is because you have a fire team of 3 instead of 6.