In Beast of Reincarnation, facility modules are rare materials that you need to upgrade your cleanse walker. Bauera is your base of operation and a place you will constantly return to as you explore the zones to give Kagura the spoils you’ve collected, as well as talk to the girl, and take care of Koo. Besides all that, the cleanse walker is also the place where you can manage important features and systems, which you can improve with modules.