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Mephisto Diablo 2 will not remove the soul stone?

I'm level 86 and I killed Baal Nightmare and Hell already. I tried to return to kill Mephisto Nightmare for a Soul Stone, but he does not drop. Why? I do not understand. OMG so how can I get ????? I can not get more?

Your nightmare ACT4 quest2 forge it? If this is done, you can not get more Mephisto Soulstone If you have not finished yet, you can get from ACT4 Cain, talk to him, he will give you a

Diablo 2-act 1