User summary: The Arcane Codex Kompendium contains more additions to the Arcane Codex core rules. Described herein are: - new advantages and disadvantages - new schools of combat and fighting styles - druidic cirles - new magic items and artifacts - weapons, armor, and siege engines - poisons, drugs, and acids - optional combat rules - new skills - new character advancement options - new spells and a flexible magic system - new creatures and rules for creating creatures - mass combat rules