As Cerybis, I would go afk quite a lot, especially if I had a full army. Have to use the bathroom, dip out afk. Yeah you could DC but that only means you have about half the time or less to lose your army if you are away for to long then boom army is gone again. Necromancer's are scary when they have a full army, the draw back is if you have to quit out your army is gone and as an undead, that's 45min with perfect success of animation, which doesn't always happen. It's frustrating af for necromancers in that regard.