Glossary

Definitions of terms used in Mimir.

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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.