Does your world have monstrous creatures?

If so, how do they look, behave and interact with the world? Are they your grotesque/monstrous version/design of a conventional animal or mythological creature, (like Giant dog, Rune bears, Trolls in Elden Ring) or something completely original and alien. Are they rare, common, extinct, a threat for humans or other civilization, or are they rumors and mythological? Maybe even God-like or depicted purely in religion.