Oh, thank you, i always thought that they needed the stones to "anchor" themsleves to the sanctuary, but izual told them something about the stones i think, something that will make them more powerful with the stones, i think.
So, I never really understood this, prime evils needed the soulstones for what ? To be able to walk the sanctuary ? If so, how is it possible that in DIII, azmodan and belilal don´t need those ?
Also what happened to mephisto´s and diablo´s souls when we destroyed the soulstones at the hellforge ? (Well i now know that they went to the black soulstone, but what would happen to them if there was no black soulstone ?)
And how did baal´s soul even get into the Black s., we never destroyed his soulstone.