“I saw the whole man slowly emerge from the window and begin to crawl down the castle wall over the dreadful abyss, face down with his cloak spreading out around him like great wings. At first I could not believe my eyes. I thought it was some trick of the moonlight, some weird effect of shadow, but I kept looking, and it could be no delusion. I saw the fingers and toes grasp the corners of the stones, worn clear of the mortar by the stress of years, and by thus using every projection and inequality move downwards with considerable speed, just as a lizard moves along a wall.” - Bram Stoker, Dracula
Benny is able to scale walls and even cling to the ceiling, so long as he is out of direct light.
Passive, always on, but only works when out of direct light. You can walk up walls and across ceilings; you move at normal speed.