Can someone please explain how the shroud system works?

You get a shroud mission and it makes you a level x mob looking character what's a class of your choosing and you go do a mission for a while?

Thinking of picking up DoD so just want to know what I am getting into.

-Nudalus

Monster Mission = Group fights as a set of monsters of predetermined level classes. 1 time events.

Shroud = turns you into a certain Class/level and some abilities associated with that class. I can shroud as a level 30 rogue and join an LDON of that level and be able to exp with them like normal. As you progress with each particular shroud, better shrouds become available of that model.

Some monster missions I believe also have some form of progression but I am not sure.

Haven't done a shroud mission yet, but did my first Monster Mission-some friends and I did a Naggy one last week. It was a riot! 96 npcs to slaughter in wave upon wave to defend the dragon! LOL we had so much fun. :)