Fighting

Climbing characters lose all AC bonuses for Dexterity and shield, and may have rear attack modifiers applied against them. They have a –2 penalty to attack, damage, and saving throw rolls. If a character is above his enemy, he gains a +2 bonus on his attack rolls; if he is beneath his enemy, he suffers an additional –2 penalty.

Any time a character is struck while climbing, she must make a climbing check, detailed in Chapter 14: Time and Movement in the
PHB. Note: you can use a default check of 30% in good conditions.

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