I had troubles with finishing The Pilgrim's Path Quest:
https://en.uesp.net/wiki/Tamriel_Rebuilt:The_Pilgrim%27s_Path

I've explored Sasamsi Egg Mine where Malkur Raran appears during the questline very early, before joining the Temple and getting to the point where you are given Pilgrim's Path quest. Because I cleared up the cave and killed trolls inside, for some reason Malkur Raran was not spawning inside, when going there for the second time with the quest active, making me stuck in a quest I'm not able to finish, to further progress Hlan Oek quest chain. I double-checked the cave several times and checked out where the NPC is supposed to spawn in the construction set, but he wasn't spawning there. I had to summon him with NPC spawning console command.