Bigby Presents: Glory of the Giants begins with a poem written by Bigby about a giant demigoddess named Diancastra, the daughter of Annam the All-Father, progenitor of the Giants. An epic poem details her role in the saga of giants, and sets a thematic tone for the book. Throughout the supplement, Bigby adds colorful commentary to flesh out the informational voice written by Makenzie de Armas, Dan Dillon, Ben Petrisor, and Jason Tondro.

Giants are referred to as a creature type, as listed in the Monster Manual, and are mythological descendants of Annam. This includes fomorians, death giants, trolls and ogres, cyclopes, and ettins as well as goliaths and firbolgs.

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