It was prideful and foolish, and it has had its consequences. The fools cast a spell in the hopes of summoning me to them. So, mortal, you have found my shrine, and you have seen my followers. Peryite wants you to go to his realm of Oblivion and rescue the souls of his worshippers from their folly. Now their souls are trapped in Oblivion while their bodies remain here in the physical world. His followers have performed a risky magical ritual in an attempt to be closer to him. Activate the statue, and Peryite will speak to you. If you try to speak to any of them, it appears they are unconscious. There are five worshippers here, but none are moving. You must be level 10 to begin this quest. No one will give directions to it, so it must be found.
Peryite's Shrine is located on the south bank of the Silverfish River, about where it begins to turn to the north (close to where the R at the start of 'River' is on the paper map).