someone on another forum told me that he was in the alpha for phase 2 and here was his reply
"Yeah the bosses in phase 2 drop the stones by the buckletload. I was getting 10-25 on alpha for each of the 3 bosses in a zone. However, those 3 bosses per zone is all there is, so I'd be cautious at relying on them for sourcestone that close to the end of the event."
Lvl 25 Mathosian Warrior - Riftblade/Paladin/Champion
Currently Farming Otherworldly Sourcestone