Primordolith
When the monolith of chaos fell from space it landed in a primordial swamp causing a chain reaction pulling the surrounding recombinant DNA together in order to form this hideous abomination!The monolith itself is soo dense that the creature's body is unavailable to withstand the immense weight meaning it is continuously being crushed but due to the chaotic nature of the monolith it's skeletal structure is repaired as fast as it splinters, this healing factor along with the deadly dark energy that emanates from within the creature's core give it an almost godlike invulnerability.
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