A perfect castle repels all attacks.
Prerequisites
Combat Reflexes, base attack bonus +3
Benefit
You can invest essence into this feat.
When an opponent makes a melee attack against an ally who is no farther away from you than half your land speed, you may use an immediate action to move up to half your speed directly towards that ally. This movement provokes attacks of opportunity as normal. As long as you end this movement adjacent to the targeted ally, you may take the attack in their place. The attack is resolved as though you were the original target of the attack, comparing the attack roll to your defenses and dealing damage as appropriate.
If your ally also possesses this feat, they may move as an immediate action after you move adjacent to them, moving into the last space you moved through. They may not move more than 5 feet with this action.
When moving with this feat, you may increase the total distance you can move by 5 feet per point of invested essence, even if this exceeds your normal movement speed.
You gain 1 point of essence.