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This is not a happy ending; see for yourself – Sandro, a great tactician and intriguer, desperately needs to return to Xeen, and for this, he doesn't care who he forms an alliance with, nor does he put much effort into choosing his allies. Besides, Lysander is a noble knight and won't betray a temporary ally prematurely.
Lysander also desperately needs to get to Xeen, but the only mage capable of taking him there and willing to form an alliance with him is Sandro. He's a bit uneasy about allying with a necromancer, but he has no choice.
Kreg Hack – this is more complicated; could Lysander and Sandro capture him? But the alliance of life and death already existed in the "Impending Storm" campaign...