All the info below comes from this website :
http://enchanter-epic.bjornstar.com/jeb.html
From Diku's guide, The Tangrin should be a 2 day spawn, is it 3 days at the moment ?
Verina and Vessel should both be random 2-7 days.
Wraith of Shissar seems to be a random 2-108 hours spawn. Diku also says that there are reports of Shissar despawning when CT spawns. Supposedly she will shout every 2 hours and respawn at her spawn point, does this mean that she should be roaming ? Also says that she shouldnt be up after a reset. The guide says to be careful when pulling her as the amy's might kill her...
Also, it seems like saying the simple phrase: "I need a sack" makes the different quest mobs give you the sack, making the prequest useless ?