Core concepts

Five ideas cover most of Eldritch OS. Everything else is built on them.

Campaign

The container for one ongoing game. A campaign holds its characters, its sessions, its scenes, and the people at the table. Membership is scoped per campaign, so a player sees the campaigns they belong to and nothing else.

Session

One sitting at the table. Sessions belong to a campaign and give the game a spine — what happened when, and in what order.

Scene

A prepared place the game happens: the tavern, the road, the boss room. A scene carries its map, its tokens, and its fog state, so switching scenes mid-session takes a click rather than a scramble.

Character

A player character or NPC, built with a guided builder and used through a full interactive sheet. Characters can be created in the app or imported from D&D Beyond.

Compendium

Your rules content. The SRD 5.2 material is built in, and homebrew you author lives beside it using the same tools — the same editor, the same fields, the same search.

How they fit together

A campaign runs a series of sessions. Each session moves between prepared scenes. The characters at the table act within those scenes, and the rules they use come from the compendium.