It's a homebrew template; essentially, he died in a place of magic that has managed to keep him alive. He'll gain the basic undead traits (immunity to crits, for example) and pretty much nothing else. And he'll be a fifteenth-level cleric who can rebuke undead. And we'll be going into a place that may be heavily trapped by magic, may be heavily guarded, and will have at least some undead guardians.
Given that he can only take necromantic, divinatory, and healing spells from the sourcebooks mentioned in the OP, what suggestions would y'all make? And what would you suggest as powers for a sword containing the essence of a God of the Paths: a god who watches over travellers, who knows the future and the past, and who guides souls between life and death?
Daniel