one adjacent surface (Athletics - no difficulty number).
Handholds, a slippery surface or other circumstances may provide a modifier to this roll.
You grant advantage to all enemies until the start of your next turn. Divide the check result by 5; you may climb this number of paces up or across the surface as part of this move action. If your check result is less than 5, you do not make any progress; on a critical failure, you lose your grip and fall.