Went to Vale of Eternal Sorrows tonight.
I joined part way through and we went and knocked off Norushen first time. Well first time for me, we had 2 stacks at the time!!!
Then we went onto Sha and eventually got him after 3 stacks had built up, and lots of time waiting for the group to rebuild after every wipe!!
The thing is, last week I started a fight prematurely to grab an extra stack and we didn't get it. Today we spent less time on a fight I prematurely started again and we did get the stack.
So, what's the criteria for getting a stack?