Click on Elkrim Pots at the Remnants of Elkrim Shrine and collect Red Sands. Then, talk to Captain Phoebe at the Algon Post. Use your quest tracker to see your progress.
Captain Phoebe: The Remnants of Elkrim Shrine have been abandoned, Captain Phoebe: but it was filled with holy energy. Somehow, I can only Captain Phoebe: sense strange energy now. HiiragiKagami: I felt it, too! Why would it carry energy like this? Captain Phoebe: The Dirty Dozen must've done something. Someone saw Captain Phoebe: them moving two large jars into the shrine. I don't know Captain Phoebe: what it contained, but it can't be good. NakanoAzusa: What do the jars look like? Captain Phoebe: Similar to other old jars around the area. Can you find Captain Phoebe: them?
Reminder Dialog
Captain Phoebe: Be careful of all of the nasty stuff inside of those jars!