This is a new Lego Monster Hand. Created by takoCHIM. It looks like it uses a whole lot of Bionicle pieces, some Star Wars (the Kylo Ren chestpiece), and Batman (the giant batwings). A lot of these pieces are very difficult to use because of their odd and large shape. When they do pop up in an MOC, it is almost in the most surprising way. It looks like the next goal is to create the Kamen Rider OOo Ankh hand. A challenge I am sure will be met.
Check out some other variants of the Lego Monster Hand here: https://twitter.com/takoCHIM/status/819153985063952385