
Arcane Codex adds 41 spells, six altar rituals, an in-game book you rebuild page by page, and a blood cult with a demon boss to Iron's Spells 'n Spellbooks.
At a glance
41 new spells that slot straight into Iron's spell books, scroll forge and loot — nothing to configure. Plus a Dominion and Emperor for every school: shut off a whole school of magic in a field around you, or bend the rules and keep casting it yourself.
Six rituals worked on Iron's altar, each one leaving something behind instead of firing once:



An in-game spellbook you rebuild one page at a time, found where its subject lives — pyromancer towers, the catacombs, the Citadel. Keep an eye on your Scroll Shelf: the Redactor steals from it at night, and if it gets away with enough pages, the Concordance comes to collect the rest in person.
A blood cult's hideout: a war camp up top, three bloody floors underneath, and the Tithe waiting at the bottom — a winged demon boss with its own music. Beat it for the Tithe's Heart and the Crown of Thorns and Veins.
Requires Iron's Spells 'n Spellbooks and its dependencies. Minecraft 1.21.1, NeoForge. JEI optional. MIT licensed — safe in any modpack.