This is an unofficial, fan-made ruleset for Mythic Bastionland by Chris McDowall.

The official rules can be found here https://chrismcdee.itch.io/mythic-bastionland or https://www.bastionland.com/

It contains character sheets with some automation as well as blank templates for NPCs, myths, sites, items, and knights. It does not include actual items and NPCs etc, you will need to input that data yourself.

It should be compatible with most CoreRPG themes. A green theme is also available here: https://forge.fantasygrounds.com/shop/items/2448/view

More information (and an example calendar) is available in the forum thread.