2018 · ソースブック（プレイを拡張するルール／オプション）

Supplement III: Eldritch Avremier

This supplement expands the arcane magic of Avremier with rules for the Arcanaflow and the Flowcaster class, along with the swashbuckling Spellfencer subclass. It includes guidance for non-human spellcasters, more than 20 new and variant spells, and details for running arcane characters in the setting. The book also adds over 40 monsters, magic items, and unique artifacts, including shapechanging Arcanthropes and dimensional Dimmer Goblins. Further sections explore the planetary system around Avremier and the planes beyond its physical borders.