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I had seen this monster before in my previous life. Over twelve heads of different monsters. Most of its composition was carcass pieces. And its entire body was encompassed with an Aura of Dread made up by the combination of countless wailing souls.
This thing was a High Rank Undead, one of the things that only the most expert of Necromancers could ever make, and even then, they required the aid of their Cosmic Deity, the Undead God, to properly build them. Yet this bastard somehow made it all by himself. Often called the pinnacle of the Undead a Necromancer could build.
An Undead Chimeric Hydra.
A mismatch of countless body parts merged together, an utter chaos of an undead monster with a near endless stamina, incredibly magical powers, and the ability to take down entire planets with enough time.