Does NO ONE listen to in-game conversations?
Adria - Act 2 - Listen to all her conversations and it explains HOW they got into the soulstone.
I come here from time to time because I like the lore, but instead of reading it, and playing through it, people just come up with these weird !@#, misinformed, explanations as to what happened when its all right in front of them.
Just like any other fantasy story or history lesson I guess.
End Rant :*(