Demon Summoner: I Am the Abyss

From bottom-tier trash to unstoppable menace. Heath Lin transmigrates to another world and gets stuck with the most despised class: Summoner. Everyone laughs—until he awakens Demonic Sacrifice, a forbidden skill that rockets him straight to SSS-rank.

Source: WEBCOMICS

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A thousand years ago, the Black Abyss invaded Earth, and nine pillars rose to grant humanity the power to fight back. Heath Lin, a notorious underachiever, attends the sorting ceremony only to receive the most despised class, the Summoner. Everyone mocks him for gaining a role as rare as it is useless. However, Heath has a secret. He has awakened a forbidden SSS-rank skill called Demonic Sacrifice. Now, Heath will exchange his life force for absolute power and rise as the true king of the abyss or die trying.

Source: Tappytoon

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Original Webtoon