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You could feasibly fit it into the actual lore and make it “balanced” in a sense. The party finds a relic with the power to rewind time by a few moments. Becomes inert for a few days/play sessions after use.
Then there is actually the potential for complete failure (the relic holder dies instantly before being able to activate it), but they still get a sense of safety that propels them into stupid dangerous stuff all the time.
The Hell Pig looks like that picture of how an alien would envision a hippo based solely on its skeleton. It was probably just a really big normal looking pig thing.