Hetairoi

Hetairoi, or the Companion, is a martially inclined sacred oath, which focuses on creating sacred bonds with others, to provide additional benefits for everyone involved within the oath.

Hellenic mythology provides several tales of such companions, of which most famous no doubt is the bond of Patroclus and Achilles. The class also takes faint inspirations of the companions of Alexander the Great, although such is mostly visible in the themes.

Contents, as seen above:

Sacred Oath: Hetairoi, for the Paladin Class.
2 new magic items; a shield and a cuirass.

- from the publisher's blurb