A Bastion is a homebase. According to the playtest, it is magical perks for having a homebase. The main critique of the playtest was, it was too much of a minigame, and it didnt integrate well with economic rules in the 2014 Players Handbook. Also, the minigame encouraged "saving up" the points for a better reward at higher levels, which effectively meant the minigame was less played. The designers confirm it will be in the 2024 DMs Guide, but we dont know if there was any revision of the playtest version.