SPOILER
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There're at least two ways to the temple:

- Talk to Mother something in Nulb, the one who runs a herb shop.
- Talk to the blacksmith in Nulb.

If you let the cleric lead you to the temple, he'll lead you into a trap. A fight with some low-CR critters, but a big one -- at least two dozens are in the fight, fighters, wizards, archers, etc.