Glossary
Definitions of terms used in Mimir.
Ambient Light : The base lighting level for a map (bright, dim, or dark). Affects what characters can see before accounting for light sources.
Blackout : A mode that hides everything from the player display. Used for dramatic reveals or setup.
Campaign : A collection of modules, characters, and documents representing a D&D adventure series.
Campaign Dashboard : The main interface for managing a campaign, with tabs for Campaign, Modules, NPCs, PCs, and Homebrew.
Clone from Catalog : Creating a homebrew item, monster, or spell by copying an existing entry from the D&D 5e catalog as a starting point, then customizing it.
Darkvision : A character trait allowing sight in darkness as if it were dim light. Common among elves, dwarves, and other races.
Document : A text entry for notes, descriptions, or session prep. Can be attached to campaigns or modules.
Dynamic Lighting : Per-token vision and light radii computed against walls and light sources on UVTT maps. See Vision & Lighting.
Fog of War : System that hides map areas outside PC vision. Reveals as characters move.
Grid : The square overlay on maps representing 5-foot spaces. Auto-detected from UVTT files; defaults to 70 pixels per square for image files.
Homebrew : Custom content created by the DM — items, monsters, and spells that don’t exist in the official D&D catalog. Managed from the Homebrew tab on the Campaign Dashboard.
Light Source : An object that creates illumination on the map (torch, lantern, candle). Affects fog of war.
LOS (Line of Sight) : Calculation determining what characters can see based on walls and obstructions.
Mapgen : The procedural map generation system that creates Dungeondraft-format maps from YAML configuration or biome presets.
Marker : A token type for points of interest on a map — landmarks, waypoints, or other notable locations.
MCP (Model Context Protocol) : The protocol used by Mimir’s AI assistant sidecar. Runs as a separate process and provides campaign management tools to AI clients like Claude.
Module : A self-contained adventure within a campaign. Contains maps, monsters, NPCs, and documents.
Monster : A creature from the D&D catalog added to encounters. Has stats, actions, and abilities.
NPC (Non-Player Character) : A character controlled by the DM. Can be simple (name and description) or full stat block.
PC (Player Character) : A character controlled by a player. Created with full stats using the character wizard.
Play Mode : Running a session: clicking Play on a module opens the DM Map window for the battle map while the main window stays on the campaign dashboard for stats and documents.
Play Notes : An auto-created module document for tracking HP, initiative, and events during a session. Opened from the Documents panel on the module dashboard; auto-saves as you type. Also called session notes.
Player Display : A second window showing what players see. Applies fog of war and hides DM information.
Reveal Map : A toggle that shows the entire map to players, bypassing fog of war.
Sidecar : A companion process bundled with Mimir that provides the MCP server for AI assistant integration. Launches automatically when needed.
Token : A visual representation of a creature or object on the map. Can be moved and configured.
Token Palette : The panel showing available tokens to place on a map.
Token Setup : The modal for placing and configuring tokens on a map before play.
UVTT : Universal Virtual Tabletop format. Map files that include grid and wall data.
Vision Radius : How far a character can see, affected by darkvision and light sources.
Viewport : The visible area of the map. The DM and player display each have independent viewports.