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Demo is a well-rounded class. Strong, pretty straithforward nuker. Has the best AoE burst damage in the game; a real horror show.

Necro is a bit weird - has some really useless abilities, but also...

I agree with Lunatic - you must have missed something. Did you get the part about day/night quests?

Day quests: open world with other players. Here is where most quests take place.

Night...