Codex Cryptica

donjon is a legendary, minimalist suite of web-based procedural generators that has served as the "Swiss Army Knife" for Game Masters since its first dungeon generator went live in 1999. Created and maintained by a developer known as drow, the site eschews modern flashy graphics and subscriptions in favor of raw utility and speed. In late 2025 and 2026, the site saw a significant "5.5 Refactor," adding full support for the 2024 D&D Core Rules, including new treasure tables, encounter calculators, and Bastion event generators. Description donjon is the ultimate tool for the "Zero-Prep" GM. It is a collection of text and image-based algorithms that can generate everything from a single NPC to an entire star system in less than a second. While newer tools focus on 3D visuals, donjon remains a favorite because it is incredibly lightweight; it loads instantly on any device and provides high-density information without any clutter. It is the "source code" of many GMs' campaigns, providing the mechanical backbone for loot, encounters, and world-building data. System Overview & Key Features Random Dungeon Generator The crown jewel of the site. It creates fully mapped-out dungeons with "old-school" aesthetics. You can specify the level, layout, and "dungeon motif" (like Sunken Temple or Abyssal Rift), and it will populate the map with traps, secret doors, wandering monsters, and room descriptions automatically. D&D 5.5 / 2024 Core Support New for 2026, the site features a dedicated "5.5" section. This includes an updated Encounter Size Calculator that accounts for the 2024 power scaling, as well as a Magic Shop Generator that utilizes the new pricing and item rarity structures introduced in the latest D&D revision. Fractal World Generator This tool uses a recursive algorithm to generate entire world maps with realistic coastlines, islands, and tectonic-like features. GMs can adjust the "Ice Limit," "Water Percentage," and "Scale" to create a unique continent or a planet-wide archipelago in seconds. Sci-Fi and Weird Fiction Suites Beyond fantasy, donjon is the premier source for Star Wars (d6/d20) and Traveller star system generators. It also features a Weird Fiction section for Call of Cthulhu players, generating eldritch tomes, blasphemous rituals, and sanity-testing NPCs. The "Endless Oubliette" For GMs running "Megadungeons," this tool uses Dyson Logos-style geomorphs to generate an infinitely expanding dungeon. As players move through the map, the GM can keep generating new sections, ensuring the dungeon literally never ends. HTML and TSV Exports Almost every generator on the site allows you to export results as a raw text file or a portable HTML page. This is essential for GMs who want to copy-paste generated NPCs directly into Discord or import loot tables into Foundry VTT or Obsidian. Additional links donjon.bin.sh - Official donjon website and site index

D&D 5.5E (officially the 2024 core rules revision) is the modernized, updated evolution of the immensely popular Dungeons & Dragons 5th Edition (2014). The new and updated version of the system was released to coincide with the game’s 50th anniversary. Rather than replacing 5th Edition with a completely new "6th Edition," 5.5E refines and expands upon the existing 5E framework and most of the already existing mechanics. It is maintaining backwards compatibility with the  adventure and source books from 5th Edition. Description D&D 5.5E is the continuation of the iconic d20-based heroic fantasy roleplaying game. Players take on the roles of daring adventurers and the Dungeon Master (DM) describes the world, the events, controls the monsters and non-player characters, and referees the rules. The 5.5E revision was driven heavily by years of player feedback and data on how tables actually run the game. As a result, the new core rulebooks, the Player’s Handbook (September 2024), Dungeon Master’s Guide (November 2024), and Monster Manual (February 2025) are better organized, have clarified language and wording, and try to bring a stronger balance between spellcasting and martial classes. It plays exactly like the 5th Edition, but with tighter mechanics, fewer confusing edge-cases, and more tactical options for the players to have a more unique approach and feel to their characters. System Overview & Key Features Weapon Masteries This is a massive change to how martial classes are played in combat. Weapons now have specific "Mastery" properties, such as Cleave, Graze, or Push. This allows the characters to apply tactical, battlefield-controlling effects on their strikes rather than only rolling for standard damage on their turns. Subclass Standardization All character classes now choose their defining subclass at Level 3. This standardizes character progression and prevents the narrative weirdness of a Level 1 character instantly unlocking ultimate magical bloodlines before they've even adventured. Streamlined Conditions & Mechanics Historically clunky rules have been completely overhauled. For example: Surprise Instead of enemies randomly losing their first turn, surprised combatants simply roll their Initiative with Disadvantage. Exhaustion Replaced with a much simpler, cumulative 1-to-10 scale where each level of exhaustion simply subtracts from your d20 rolls and reduces your movement speed. Hiding Normalized so that successfully hiding essentially grants the "Invisible" condition, removing ambiguity for the DM. The Bastion System Introduced in the new Dungeon Master's Guide, this is an official customizable base-building system. It allows players to construct and manage their own strongholds. From arcane observatories to gambling dens. Apex Monsters & Upgraded Threats The 2025 Monster Manual expanded the roster to over 500 creatures, redesigning legacy stat blocks to be more dynamic in combat. It also introduced "Apex Monsters". These are a higher Challenge Rating versions of classic monsters (like an Apex Hag) designed to serve as more challenging bosses or enemies adding more danger and flavor to the basic version of the creature. Backwards Compatibility The core promise of 5.5E has been that you can still run older 5E adventure modules or campaign settings, even while adapting and using the newer ruleset and systems. If a table wants to bring a 2014 character class into a 5.5E game, the rules are there to accommodate, though it is highly encouraged to transition older characters to the updated 2024 mechanics, as the new systems bring  horizontal expansions to various classes and abilities. Additional links D&D Beyond Basic Rules - Free basic ruleset for the 5.5E D&D

A portable, offline-first DM tool built with Flutter. Manage combat, track timelines, and project a rich campaign wiki seamlessly on any device. Overview & Key Features Project to Players Click "Toggle Player Screen" to open a second window. Drag any image — NPC portrait, item card, or map — to the "Drop to Project" bar. It appears instantly on the player-facing screen. Battle Map Toolkit Load a map and use four tool groups: Navigate to pan, Ruler/Circle for measurements in feet, Draw for annotations, and Fog to reveal or hide areas. Everything syncs to the player screen in real-time. Mind Map Canvas Right-click to add Notes, Images, or Workspaces. Middle-click to pan. Zoom freely — the LOD system keeps everything smooth no matter how complex your world gets. Soundpad Open the audio panel, pick a theme (e.g., "Forest", "Tavern"), and use the Intensity Slider to dynamically shift the music. Build custom themes with layered tracks. Links elymsyr.github.io - Official website github.com - GitHub Repository github.com - Developer docs patreon.com - Patreon page