Components

Login + Resource Server

Problems:

1. Allowing integration with other services (D&D Beyond, Orcpub)
2. Locking non-free content (user created / WOTC deal?)

Solutions:

1. Allow connecting accounts from other services using OAuth2
2. Use OAuth2 to build a resource server that restricts access to content

Game Client

Problems:

1. Tracking movement and turn-order during encounters
2. Reducing visibility of the map to players
3. GM reaction on certain events
4. Adjusting map/page changes before showing to players

Solutions:

1. Maps with collision (and lighting) boundaries to make use of path-finding, integrated with character sheet for movement and initiative
2. FoV algorithm to hide tiles of the map that are out of sight (optional collision integration)
3. Pre-scriped actions using a scripting language
4. Rollback/commit on map transformations.