The Mirth Mosaic appears as an ever-shifting tableau of glowing, tessellated fragments. Its border is a worn film reel etched with micro-scenes from across the Chainsmas Chronicles, and its surface is cool except for a pulse of warmth when a new festive archetype is locked into place within a tag's design. The central image constantly reconfigures, previewing potential character combinations for future illustrations.

It serves as the universal storyboard, determining which holiday archetypes from across the ten leagues will share a scene on any given bag tag, thus visually weaving the brotherhood's disparate adventures into a single tapestry.