He poped 3 times in 7 rounds, always drop fellstone.
According to the previous posts, ppl says ac aug is a easy drop but I found it isn't.
At least, the drop rate should lesser than 50%..
EDIT:
end result
He poped 6 times in 14 rounds
dropped 4 fellstone, 2 jewel of the stalwart
Edited, Nov 10th 2011 4:14pm by zight