Bastion Builder
A free, unofficial planner for the 2024 D&D Bastion rules. Commission facilities, lay them out on a floorplan grid, and run the weekly Bastion Turn — all in your browser, no account needed.
Everything you build is written to this browser only. Nothing is uploaded unless you turn on cloud sync yourself. Export a bastion to a file to back it up or hand it to someone else.
Your library
No bastions in this browser
Key to the seals one floor, three kinds of mark
- Chamber Every room you have raised — the ones your level unlocks and the ones gold buys.
- Corridor The passages, walkways and balconies that join them.
- Defenses The outer ring of wall, gates and drawbridges.
- Ruling The sheet's own squares — one to a five-foot cell, ruled firmer every twenty-five.