Bat Hook

Functionally, the Bat Hook is similar to the Grappling Hook, with a longer reach. The image below shows the reach comparison between the Spooky Hook, Bat Hook, and Dual Hook. As of 1.2.1.2, it drops from Goodie Bags. Bat Hook also pulls you towards the wall noticeably faster than other grappling hooks.



Trivia
This is a reference to Batman and more specifically one of his many gadgets The Bathook.