Scaling walls

The scale walls ability is used by the Zephonim(the children of Zephon). Zephon himself can't use this ability due to the fact that he has become apart of the Silenced Cathedral and is thus immobile. The Zephonim can scale all walls, while Raziel can only climb certain walls. Perhaps because the Zephonim are more arthropod-like(insect,arachnid,crustacean,eta) they can use the gift to it's fullest material realm extent because they gentically evolved this gift. In Defiance Raziel can use this gift in the spectral realm, the reason why is because he is the Blood Omen 1 era and the corruption of the Pillars has overlapped the realms together allowing raziel to scale walls even in the spectral realm. This only lasts as the Pillars are intact and very corrupt, once they're broken Raziel can only scale walls in the material realm again. Also, in Defiance Kain can scale walls, the reason why is currently unknown.