You will find him in Boneriven more precisely at Passaggi Burial. After bringing the first 30 pages of the book to Vulgrim you will gain access to the Tomb and unlock the weapon. You will find it in the Lostlight area, more precisely in the third tomb, during the mission The Book of the Dead. To unlock this talisman, simply complete waves 1 through 25.
You will find it in the area of The Crucible during the Fire Test. You will find it in the Tri-Pietra area during the secondary mission "Shaman's Craft" that will be assigned to you by Muria. Once you have completed all 100 waves of the Fire Test in a single game session, you will have access to wave 101. You will find him in the Crucible area during the Fire Test. After bringing the first 20 pages of the book to Vulgrim you will gain access to the Tomb and unlock the weapon. You will find it in the Lair of the deposed King, that is, in the second Tomb, during the mission The Book of the Dead. Once you have solved the maze, you will need to defeat the final boss to get the weapon. You'll find him in the Soul Referee's Labyrinth. After bringing the first 10 Pages of the Book to Vulgrim you will gain access to the Tomb and unlock the weapon. He was found in the first grave during the Librium of the Dead missions.
You will have to complete waves 76 to 100 of the Test. You will find him in the area of Il Crucibolo during the fire test. As if the main story, side quests and collectibles weren't enough, in Darksiders 2 To make your adventure perfect you need, I would say almost indispensable, to find and unlock even the legendary weapons, legendary armor, legendary talismans and legendary scythes that will make Death truly unbeatable.