Optional Systems

Variant Rules

Optional subsystems meant to be adopted intentionally at session zero, not assumed by default. Core player rules live in the Rules Compendium; GM operations live in the Game Master Reference.

Library Overview
Alternative Rules

Different damage tracks, armour that stops hits, hero points, skill variants, automatic bonus progression, and rules for young characters.

GMG UC UCamp PFU ARG
Combat Variants

Gunpowder weapons, formal duels, performance combat for crowds, siege engines, and vehicle rules.

Ultimate Combat
Magic Variants

Spell research, spell duels, Words of Power, spellblights, psychic magic, occult rituals, simplified spellcasting, and spell alterations.

UM OA PFU
Campaign Variants

Honor, fame, hex exploration, bargaining, kingdom building, mass combat, sanity, race builder, and horror systems.

UCamp GMG HA
Mythic Adventures

A second axis of power beyond character levels — mythic tiers, path abilities, and the universal power pool.

Mythic Adventures
Technology Guide

Numerian science-fantasy rules — power cells, radiation, artificial intelligence, and skymetals.

Technology Guide
OGL 1.0a Notice. Pathfinder-derived Open Game Content on this page is used under the Open Game License v1.0a and Section 15 notice.