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A knight of the sacred seal is never alone because she has formed a true partnership with a single vestige.

Requirements

Class Features

Weapon and Armor Proficiency: You gain proficiency with all simple and martial weapons, and with all armor and shields (except tower shields).

Soul Binding: At each knight of the sacred seal level, your soul binding ability improves as if you had also gained a level in the binder class. Thus, your knight of the sacred seal levels and binder levels stack for the purpose of determining your bonus on binding checks, the effectiveness of your vestige-granted abilities, your ability to bind higher-level vestiges, and the number of vestiges you can bind. You do not, however, gain any other benefit a binder would have gained.

Aligned Strike (Ex): Your natural weapons as well as any weapons you wield are treated as aligned for the purpose of overcoming damage reduction. The alignment of your weapons matches your own to as great a degree as possible. Thus, if you're lawful good, your weapons strike as both lawful-aligned and good-aligned for the purpose of overcoming damage reduction, but if you're neutral good, they strike only as good-aligned. If you are neutral, your weapon strikes as one alignment component of your choice: chaotic, evil, good, or lawful. You must make this choice upon entering the prestige class and cannot thereafter change it.

Patron Vestige (Su): When you become a knight of the sacred seal, you select any one vestige that you have previously bound as your patron. You develop a stronger than normal relationship with this vestige that grants you several benefits as you advance in this prestige class. If you expel your patron vestige by means of the Expel Vestige feat or do not renew your pact with it on any given day, you lose access to all supernatural class features gained from this prestige class until such time as you contact that vestige again. You can bind other vestiges in the interim, as normal for the binder class, but you gain no additional benefits from those pacts. You are never at risk of making a poor pact with your patron vestige.

Vestige's Protection (Su): When you attain 2nd level, your relationship with your patron vestige deepens, prompting it to take steps to ensure your protection. As a swift action, you can acquire an insight bonus to your Armor Class equal to your Charisma bonus (minimum 1). The same bonus also applies on your Reflex saves. Both of these benefits last for 1 round. Once you use this ability, you cannot do so again for 5 rounds.

Vestige's Protection Aura (Su): When you attain 3rd level, your patron vestige extends its protection to all creatures adjacent to you whom you designate as friends. Whenever you activate your vestige's protection class feature, those benefits apply to all designated allies adjacent to you.

Vestige's Power (Su): At 4th level, you can draw upon the power of your patron vestige to augment your fighting abilities as a swift action. You gain a +2 bonus to Strength, a +2 bonus to Constitution, a +10-foot bonus to your base land speed, and a +4 bonus on Will saves for 1 round. Once you have used this ability, you cannot do so again for 5 rounds.

Apotheosis (Su): At 5th level, your type changes to outsider, and you gain the native subtype (see the perfect self monk class feature on page 42 of the Player's Handbook). You also gain damage reduction 10/magic.

Vestige's Surge (Su): At 5th level, once per day, when you activate one of your patron vestige's powers, or your vestige's protection or vestige's power class feature, you can choose to activate that ability again immediately rather than waiting the usual 5 rounds.

Multiclass Note: A paladin who becomes a knight of the sacred seal can continue advancing as a paladin.

Advancement