From publisher blurb:
The Martyr is an undead Paladin, a once-noble warrior who has sacrificed everything, including their own identity, in eternal service to a divine cause. With a skeletal head and a body in varying stages of decay, the Martyr stands as a solemn guardian of holy sites and sacred duties, wielding divine power to protect what they have been tasked to defend. Their unwavering devotion has granted them a cursed immortality, and they fight with a relentless focus, striking down any who would threaten the sanctity of their charge. The Martyr’s presence is a chilling reminder of the extremes to which devotion can drive a soul, transforming them into a powerful yet tragic figure, eternally bound to their sacred mission.
Like the Lich is an Undead Wizard, this is an exploration of other 5e Classes into undeath and eternal life, including background and stats.