Petrus of Thorolund
Lore
Petrus is a cleric of the Way of White from Thorolund. He allows the Chosen Undead to enter the Way of White covenant.
Petrus guards Rhea who is on a pilgrimage to find the Rite of Kindling along with her other bodyguards, Vince and Nico. The first time the player meets him, he'll be alone in the Firelink Shrine, waiting for them to arrive. In exchange for souls, Petrus will provide information about the Undead Mission.
Theories
Petrus is Not Undead
Dialogue
Sources
PREV: Patches
NEXT: Quelaag's Sister
Curious to know that the items hidden in firelink belong to it. I wondered "what reason for a cleric to have hidden eye orbs?" The items in the chests are from weapons he uses. Wait… Can undeads use red-eye orbs?