Inexorabilis

Inexorabilis is unknown creature with only multiple sightings. It's most famous appearance was in the Primordial Planet/Prehistory lore from 2017. Inexorabilis is known to have swallowed Tyrannosaurs and other large theropods whole. Although nobody could weigh it, as they couldn't dare get close, scientists and palaeontologists estimate Inexorabilis to have weighed around 150 tonnes. Inexorabilis is expected to collapse under it's own weight. Inexorabilis died in the lore as swallowing a Diablovenator burst it's stomach.

Inexorabilis is fictional.