this has been posted, but would like to confirm.
you can do bloody vampire and bone colection very very easy.
shroud down.
after you shroud down, have a higher lvl friend, go kill your mob in seconds. then loot with other toons.
works for bone colection too...just loot with the shrouded toon, have friend do killing.
for final mob in bone colection, you have a second or two before it is active, hand in items with shrouded toon, then run! have friend nuke it once to kill. is great, i am doing it with 3 accounts, botting two of them.
i had the bots..and my toon shrouded to lvl 25. i then camp my toon i doing it for, and kill with my main, having another bot do the looting. don't know how to do final for bone colection without a friend, but still, was easy to ask to come kill it fast,
bloody vamp..total cake, kill with one (lvl 70) loot with another, poof, task over after i log MY toon back on and do hand in.