Escape From Esurio

You ever hear of a mythical creature called Esurio? Creature as old as time? No? I didn't think so. In fact, no ones heard of it. But how has no one heard of such a creature? I mean even the most notorious creatures from any mythology, like the Nemean Lion or the Hydra from the Greeks, the Serpent from Egypt, the Griffin from Rome, and the dragon from Europe are widely known. So why have we never heard of Esurio? Because whoever sees him goes missing, only to pop up, freshly dead several years later, up to a century after their disappearance. But its never been proven. But I know what it really is, because I escaped it. I was the first and probably the last. No scratch that.... someone else might, one day.... and I wasn't alone in my escape... But this is how it started, and it was a day like any other...