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The Summoner is found at the tip of one of the four arms of the [[Arcane Sanctuary]], a strangely-beautiful, psychedelic-styled area in Act Two. Which of the four tips the Summoner occupies is randomized, but his is a bit longer than the others and has a distinctive shape, so you'll know it as soon as you get near, even if the quest button pop up doesn't warn you. The Summoner is a quest boss; he must be killed to finish [[Quests_Act_Two#Quest_Five:_The_Summoner|the fifth quest]] in Act Two, and killing him is required to open a portal to the [[Canyon of the Magi]] and to learn which of the seven tombs of Tal Rasha is the true tomb. He is implied to be the Sorceror from Diablo I, corrupted much as [[The Wanderer|the Warrior]] was.