The Arthropleura roamed the Earth 300 million years ago and are the ancestors of centipedes and millipedes

 https://www.cbc.ca/radio/asithappens/arthropleura-heads-1.7350597

The Arthropleura might look like a monster, but it was just a prehistoric large creature. 

https://www.britannica.com/animal/Arthropleura

https://dinopedia.fandom.com/wiki/Arthropleura

https://upload.wikimedia.org/wikipedia/commons/1/1c/Reconstruction_of_Arthropleura_sp._MNHNF.F.SOT002123.jpg

https://thedigitallabyrinth.blogspot.com/search?q=The+Arthropleura