Clinging

From publisher blurb:

Have you ever wanted to climb up a creature so big it doesn’t even know your character is there? Sidebar: Clinging is here to help you fulfill that desire. Climbing is simple, but clinging is more versatile and allows for cinematic experiences to the ascension of the big and tall. Clinging rules give you options for what you can do while trying to cling to a surface. And an all new Clinging feat introduces an alternative to the Climb skill or investing solely in Strength. Sidebar: Clinging gives you options for every larger than life encounter.