New Combat Actions: Defend Another and Sacrifice

Defend Another
As a standard action, you may declare that you are defending adjacent charges. Anyone attacking a target through a square adjacent to you or that you threaten with a shield must beat an opposed attack roll. The AC bonus of your shield, if any, applies to this roll. If you fail this check by five or less, you take the damage instead of your intended target. If you are not wielding a shield, you always take the damage from a ranged attack. If you block a ranged touch spell, such as a ray, you are treated as the target of the spell as though successfully hit. You are considered flat-footed while Defending Another, denying you your dexterity bonus to AC and CMD and preventing you from taking Attacks of Opportunity unless you have Combat Reflexes or similar.

Sacrifice
As an immediate action, you may intercept an attack or spell targeted at an ally. You may move up to five feet to do so, or up to ten if you choose to end your movement prone. You must move to a square the attack is passing through, potentially including your ally's square; if you end your movement in an occupied square, you begin your next turn prone. You take all the effects of the attack or spell as though you had been the original target, and do not receive your dexterity bonus to AC, but are not subject to precision damage from this attack.

Improved Defend Another
Prerequisites: BAB 1+

You are deftly competent in your protection of others. While defending another, you may move up to your speed throughout the round to intercept attacks on your charges, as long as you do not leave a square adjacent to your charges. This movement counts against your movement for your next turn.

Greater Defend Another
Prerequisites: Improved Defend Another, BAB 6+

You are an unassailable bastion for those under your protection. While defending another, you are no longer considered flat-footed. Additionally, whenever someone attacks one of your charges, you may take an attack of opportunity against the attacker (counting against your number of attacks of opportunity for the round).