Since you already went to Spellhold Yoshimo must be destroyed. You can get 200,000 exp if you give his heart to the temple-guy in Slums.
There is a way to save him by leaving him, before going into spellhold and telling him to wait, I think. I never tried it,since I don't want to travel with a potential traitor. But it's up to you.
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You cannot escape the inevitable.
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