(Combat Feat)
Prerequisites: Base Attack Bonus +5, Climb 5 ranks.
Benefit: As a standard action, you may climb onto the back of a creature two sizes larger than you or larger. To do this, you must successfully grapple your opponent adding to the standard grapple check your ranks in Climb and any bonuses to Climb you possess from feats, character traits, racial traits, spells, magic items, or class abilities. If successful, you move adjacent to your opponent as if you were grappling, but neither you nor your opponent gain the Grappled condition.
While there, your Gnat Fighting opponent may not attack you or target you with spells. You cannot perform any action that requires more than one hand because you must hold on with one of your hands and your knees. The exception to this is that you may move at half speed while Gnat Fighting so long as you do not leave base contact with your opponent. You incur attacks of opportunity as normal, INCLUDING your Gnat Fighting opponent (the movement temporarily exposes your position).
Your opponent may make a successful standard grapple check to dislodge you.
You may disengage yourself from Gnat Fighting at any time, but must make a successful jump check to avoid taking damage from falling depending on the size of the creature you're engaged with.