You'll know if you have this quest in your game by checking the color of the water in the fountain in the middle of the town (near Cain). If the water is brown, as opposed to its normal blue, you'll have this quest on the second level. If you talk to Pepin (the healer) in town after you start the first level, he will give you this quest. If you don't happen to notice the color of the water in the town fountain, you'll still be able to tell that this quest is in your game if, during your exploration of the second level, you run into a crack in the wall that is surrounded by candles (described as to a dark passage)

Initiate the quest by talking to Pepin. Once you find the crack in the wall, return to town prior to exploring it, if you want more of the storyline. The opening will take you to a separate mini-level where you'll have to clear all of the monsters in order to solve this quest. You'll likely meet your first Goat Men (the easiest Flesh Clan variety) and a bunch of Fallen One types, Devil Kins with swords and Carvers with spears. Once you kill all of the monsters, the waters in the mini-level will clear and you'll have completed it. Don't forget to return to Pepin to obtain your reward - the Ring of Truth.

Monsters:

Carvers (with spears) [22], Devil Kin (with swords) [11], Flesh Clan Archer [1], Flesh Clan [4]

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Reward:

Ring of Truth from Pepin

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