The most scariest enemy

[Redeemer]

Grunts and brutes were equally scary to me. After all, the only real difference between the two is the amount of damage they do to you.

The Kaernk was pretty frightening the first time I ran into one, but ultimately their limited mobility made them much less scary to me. If I was voting for most original monster though, I'd definitely go with the Kaernk because its got an original name and its body is made of otherworldly elements that Daniel cannot possibly see.