For the non-gaters out there you can do this entire quest as a shroud. It can save you time since you get a gate spell as a shroud, plus you can easily get run 4 if your 65 plus.
Also you can get a lockpick set and turn into a goblin rogue and save yourself the time camping the key. First time I went into befallen there was 5 people trying to spawn the shadowknight for the key. By the time I ran to POK and came back they had still not got the key and so I let them in as a goblin rogue (after I got my hail in of course).
I do have a question though? Do you only get 1 chance at the monster mission after you turn your ticket in? I have no desire to do the other quests as I Feel they are a waste of time for the reward (don't feel like fighting with other players to camp the mobs either). I have the ticket from trick or treat quest but Im afraid to use it.