First, let’s clarify the terminology. Within the fandom, Zilla (without the "God") often refers to the 1998 TriStar design—a slender, agile, iguana-like creature. The "Mature Zilla" update takes that body plan (bipedal, theropod stance, dorsal fins) but ages it brutally.
The original "Mature Zilla" benchmark was set by the 1995 film Godzilla vs. Destoroyah , where Godzilla literally melts down from radiation poisoning. However, the updated movement takes this much further. mature zilla updated
Based on the name, it sounds like it could be one of a few things: A Mod for a Game: Specifically for titles like First, let’s clarify the terminology