Brethrian is a miaspec gender in the Sylvian System, one of the four Nature Systems. It is characterized by both a general connection to nature and forests, but is also distinct in that, due to it being part of the Sylvian System, it is also characterized by an intense and stunningly overwhelming connection to nature that can't be describe by general naturecore terms. It is also miaspec. Brethrian people could describe their alignments in several ways-
- They feel aligned to masculinity because their gender feels related to forest aspects that are traditionally seen as masculine (like trees, stones, etc.)
- They just feel a connection to masculinity that is not due to their naturecore identity but may still be entwined with it
- They feel a mixture of both of those options
The term brethrian was coined by FANDOM user Reign of the breadsticcs in mid-February of 2021, and the flag was designed later that month by the same user.