The Codex Exaltum is a sourcebook for the Castles & Crusades tabletop RPG (published by Troll Lord Games) that bridges the gap between mortal adventuring and divine or cosmic play. It is designed for players and Castle Keepers who want to explore high-level campaigns involving demigods, celestial beings, and planar travel.
Here is a breakdown of what the Codex provides:
1. Ascension and Divine Power
The core of the book focuses on how characters can transcend their mortal limits. It introduces mechanics for Divine Ranks, allowing characters to progress from powerful heroes to minor deities. This includes:
Divine Templates: Frameworks to modify standard classes with celestial or infernal attributes.
Portfolios and Domains: Rules for managing a deity’s sphere of influence (e.g., War, Knowledge, Nature) and how those provide specific mechanical boons.
2. High-Level Mechanics
Since Castles & Crusades is built on the Siege Engine, the Codex expands those mechanics to handle the "Exalted" scale of play.
Exalted Feats and Abilities: Special powers that go beyond standard class features, allowing for world-altering feats of strength or magic.
Massive Scale Combat: Guidelines for handling encounters where characters are fighting entities that can level cities or command entire armies.
3. The Multiverse and Cosmology
The book provides a detailed look at the multiverse within the Castles & Crusades setting, though the rules are modular enough to fit into any homebrew world.
Planar Geography: Descriptions of the Upper and Lower Planes, the Ethereal, and the Astral reaches.
Planar Hazards: Environmental rules for surviving in realms where the very air might be composed of pure thought or searing energy.
4. Divine Bestiary and NPCs
A significant portion of the book acts as a manual for high-challenge entities. This includes:
Avatars: Stat blocks for the physical manifestations of gods.
Celestial and Fiendish Legions: Powerful monsters ranging from Arch-Devils and Demon Princes to Solars and Valkyries.
Relics and Artifacts: Rules for creating and wielding items of power that are sentient or possess "Artifact" status within the Siege Engine.
5. Castle Keeper Integration
For the CK, the book offers advice on managing "End Game" scenarios. It tackles the narrative challenges of keeping a game challenging when the players have essentially become gods, focusing on politics between pantheons and cosmic-level threats that can't be solved by simple combat.
Comparison with Standard C&C
| Feature | Players Handbook | Codex Exaltum |
| Level Scope | 1–12+ (Standard) | 12–20+ (Exalted) |
| Setting | Local / World-based | Multi-planar / Cosmic |
| Power Source | Class Skills & Spells | Divine Sparks & Portfolios |
| Primary Goal | Treasure & Reputation | Influence & Immortality |
Note: While the Codex Exaltum is written for Castles & Crusades, its OGL (Open Game License) roots make it relatively easy to port into other d20-based systems or "Old School Renaissance" (OSR) games that use similar attribute-check mechanics.
You would find Codex Exaltum most useful when your campaign shifts from "surviving the world" to "shaping the universe." Because it is built on the Siege Engine (which uses attribute checks as a primary resolution mechanic), it is surprisingly versatile for several different campaign styles.
Here are the specific scenarios where this supplement fits best:
1. Transitioning to "End-Game" Play
In many traditional fantasy campaigns, characters eventually hit a "ceiling" around levels 10–12 where local threats (orcs, dragons, giants) no longer pose a challenge. You would use this supplement to:
Transition characters into world leaders or demigods.
Give players a reason to keep adventuring by introducing Planar threats that threaten their base of operations.
2. High-Concept Superheroic Settings
If you are running a game in a custom urban setting—like a sprawling metropolis where "supers" or "ascended" individuals operate—the Codex provides the mechanical "heft" needed to simulate powers that go beyond standard magic.
The Divine Templates can be reskinned as "Origin Stories" or power tiers for high-level heroes.
The Massive Scale Combat rules help if you need to simulate a hero defending a city skyline from a colossal threat.
3. Cosmic Horror or "Dying Earth" Settings
For settings influenced by weird fiction (like the works of William Hope Hodgson), the Codex is excellent for defining the Elder Entities or the "Great Ones."
Instead of making a cosmic horror an unbeatable plot device, the Codex gives you the stats to make it a "closable" threat for high-level characters.
The Planar Hazards are perfect for describing bleak, alien landscapes where the laws of physics are breaking down.
4. Cross-System "Power Leveling"
Since the book is rooted in d20-style mechanics but simplified for the Siege Engine, it’s a great "bridge" supplement. You could use it to:
Beef up an OSR game: If you find systems like Barrows & Borderlands or the Red System too "gritty" for a specific arc, you can borrow the Exalted Abilities to give your players a temporary power boost.
Modern/Retro-Tech Scifi: In a setting featuring advanced technology or experimental rigs, "Divine Ranks" can be reimagined as Cybernetic or Genetic Ascendance.
5. Managing a Pantheon
If your players are interested in the "ruling" aspect of the game—building temples, gaining followers, and managing a domain—this book provides the math for it. It turns "faith" into a resource that has a direct impact on the game world.
Summary of Utility
| Use Case | How to use the Codex |
| The "Level 13" Wall | Use the Ascension rules to keep the campaign from stalling. |
| Plane Hopping | Use the Multiverse section to build a "Hollow Earth" or "Astral" arc. |
| Boss Design | Use the Divine Bestiary to create villains that feel truly "otherworldly." |
| System Hack | Port the Siege Engine attribute-scale to other d20 systems for a faster "High-Level" feel. |
To integrate Codex Exaltum into a fantasy world, you essentially need to decide how the "ceiling" of mortality is broken. Since the supplement is built on the Siege Engine, it’s designed to be modular—you can plug it in as a natural progression or a sudden, world-shifting event.
Here is a roadmap for integrating these high-level rules effectively:
1. The "Ascension" Catalyst
In a standard fantasy setting, you need a narrative reason why characters are suddenly gaining Divine Ranks. Common integration methods include:
The Power Vacuum: An existing deity is slain or disappears, and their "Portfolio" (War, Justice, Shadows) scatters. The players must collect these "sparks" to prevent them from falling into the wrong hands.
The Mantle System: Powerful artifacts or ancient "Great Rigs" of power allow mortals to channel cosmic energy. This links their progression to specific locations or items.
The Apotheosis Quest: Once players hit level 12+, they must undergo a specific ritual or trial (like crossing a "Night Land" or reaching a "Celestial Spire") to unlock the Exalted tiers.
2. Scaling the Siege Engine
The beauty of Castles & Crusades is the simplicity of the attribute check. When integrating the Codex, you move from Challenge Bases to Exalted Stakes:
Attribute Checks: Instead of just checking to see if a character can break a door, use the Codex's scaling to see if they can hold up a collapsing mountain or out-shout a hurricane.
Saving Throws: Shift the focus of saves from avoiding "Poison" to resisting "Erasure" or "Planar Displacement."
3. Populating the World with "Exalted" Rivals
For these rules to feel impactful, the world needs to react to the players' new power levels.
The Peerage of Power: Introduce other "Ascended" NPCs who have been operating behind the scenes. This turns the game from a dungeon crawl into a game of Cosmic Politics.
Avatar Manifestations: Instead of fighting a god directly, players might first clash with an "Avatar" using the stats in the Codex. This allows for high-stakes combat without ending the campaign prematurely.
4. Environmental Shifts
Use the Planar Geography rules to transform your existing map.
Bleed Zones: Areas of your world start taking on traits of other planes (e.g., a forest begins turning into a crystalline "Ethereal" landscape).
Sanctuaries: High-level players can use the rules to create their own "Pocket Dimensions" or sanctums that exist outside the normal flow of time, serving as a hub for their operations.
Integration Checklist
| Step | Action |
| Mechanical Hook | Decide if characters keep their classes or "Multiclass" into Divine Templates. |
| Resource Management | Use "Divine Favor" or "Portfolio Influence" as a new currency for world-altering effects. |
| Threat Escalation | Replace standard monsters with entities that possess "Legendary Resistance" or Planar traits. |
| Narrative Goal | Move the win condition from "Get Gold" to "Reshape Reality" or "Defend the Pantheon." |
A Note on Tone
When moving into high-level play, the tone often shifts from Grit to Epic. If your world has a "weird fiction" or "retro" aesthetic, you can flavor the Codex’s divine powers as "Ancient Science" or "Cosmic Resonance" rather than traditional religious magic. This keeps the high-level mechanics functional while preserving the specific atmosphere of your setting.
