Even thevstrongest men cannot weild swords larger then their hight. And this sword isn't even build as the largest swords for humans are. The creature that weilded this weapon was clearly greater then human hight.
I'm 100% sure humans were not the only sentient species in the middle ages
Kayden Allen
Eli Wilson
We have many sources.
David Nguyen
European cryptid myths are all because the ancients would find the skeletal remains of extinct species and the only way they knew how to explain them was by imagining them as monsters.