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Wall Acrobat (3.5e Feat)
From D&D Wiki
Wall Acrobat [General]
Prerequisite: Dex 15, climb 12 ranks, 2 movement skill tricks
Benefit: climb up or run along walls at half your base land speed as a move action. This ability requires one free hand, and must begin and end the climb on a horizontal surface. Must make a DC 25 climb check