I found the brooch, the knight, the owl, the pendant and the chalice, but now I am stuck, I can't find the last relic, and I think I explored everywhere. Any advice?

This game seems to have identical assets ripped straight out of Crimson Snow by Steppe Hare Studio. Not sure if this is a public asset, I could be wrong, but judging by the quality of Crimson Snow I'd just always assumed they made their own models. But the lady and the face and the death animation are almost 1:1 as far as I can see....

So we play as a human fighting vampires? Or we play as a vampire with vampire powers? Honestly from the description Im guessing the 1st one; we play as a human fighting all vampires otherwise I would be asking why didnt it list the powers? :)

And I've the key.

As above