Never known much about Grendel until recently. And I still couldn't really tell you anything. I knew of Hunter Rose and Prime, but I found out this guy is like Iron Fist. There's a lot who have taken up the moniker. So, I sanded down a Spiderman head, and dremeled in the back so I could add the straps from an Iron Fist head. Used the two pack Iron Fist, so they're a little shorter. I also hit a roadblock on the staff with the forked blade. I wasn't sure hot to pull it off, so I gave him the naginata blade instead. If I can get more Spiderman and Iron Fist figures I may actually look into making more of them.