Cross Narrow Surfaces

You can use Acrobatics to move on narrow surfaces without falling. A 'narrow surface' is any surface less than half your normal space: Thus, for Small and Medium creatures, a space less than 2 and a half feet wide is considered 'narrow'. (For people who feel this is too strict, YOU go out on a two-foot wide ledge a thousand feet up the side of a building and report whether it feels 'narrow'.) An 'extremely narrow' space is less than one fifth the width of a narrow space, or for a small or medium creature, six inches wide. For further modifiers, see the table below. Walking a tightrope is considered a use of this skill, with the lowest entry on the table below. A successful check allows you to move at half speed across such surfaces. Only one check is needed per round. While you are using Acrobatics in this way, you are considered flat-footed and lose your Dexterity bonus to your AC (if any). If you take damage while using Acrobatics, you must immediately make another Acrobatics check at the same DC to avoid falling or being knocked prone.
Action Required:	Move action at half speed (+10 to check DC to move at full speed)
DC of Check:	Narrow Surface Tiny Width Small/Medium Width Large Width Acrobatics DC > 1/2 space wide > 15 inches > 30 inches > 60 inches 01 < 1/2 space wide - 1/5th space wide 15 inches - 6 inches 30 inches - 12 inches 60 inches - 24 inches 51 < 1/5th space wide - 1/10th space wide 6 inches - 3 inches 12 inches - 6 inches 24 inches - 12 inches 10 < 1/10th space wide - 1/30th space wide 3 inches - 1 inch 6 inches - 2 inches 12 inches - 4 inches 15 < 1/30th space wide < one inch < two inches < four inches 20 Walking a tightrope 1/2 inch thick one inch thick 2 inches thick 30 1 - No Acrobatics check is needed to move across these surfaces unless the modifiers increase the DC to greater than 10.
Modifiers to Check	Using a balancing pole while traversing a narrow surface grants a +5 circumstance bonus to the Acrobatics check. Moving full speed (instead of half) is a -10 penalty Unsteady surface, -5. A narrow ledge made of piled rubble, or an unsecured tightrope, are examples of such. Environmental effects, varies. Climbing a steeply sloped ledge, coated in ice, in a rainstorm, with violent gusts, for example. See this page for examples.
Take 10? / Take 20?	{{{Take10-Take20}}}
Allows Assists?	{{{Assist}}}
Results of Success	{{{Success}}}
Consequences of Failure	Failure usually means falling or falling prone.
Retry Allowed?	If you are not prone, and have movement remaining, you may attempt to cross again in the same round. If not, it requires another move action.
Provokes AOO?	Yes, as with any normal movement.