Are you using the version with those places added in it? If yes, then do the quest where you have to find the 3 missing lizardess in the ruins to unlock the dark swamp as part of that quest when exploring the normal swamp, and if you talk to the white lizardess in the ruins, one of the talks option you choose should have her mention the forgetten Temple during the talk with her in the Convastion part of the sceen.
1. Do the more potion quest for Shopkeeper to learn how to make restrain potion (You can also just check the recipe guide if you prefer).
2. When you know how to make restrain potion there is a first quest for Priestess about bringing her some of the restrain potions.
3. After finishing restrain potion quest for priestess, lost acolyte quest is unlocked.