genre and language aren't set on the beatmap page, should be set to Electronic and Instrumental
戦[sen-goku]國 ～甲午の乱～ as source, this song is from a BMS event
https://manbow.nothing.sh/event/event.cgi?action=More_def&num=96&event=93
tags to add:
sengoku kougo no ran - romanized source
instrumental - for the "language" (required per RC, hence the problem stamp)
post - for "post drum'n'bass", seems to be some sort of a subcategory of dnb? also included in the source genre
fa - abbreviation for featured artist, commonly used for featured artist listings
bof bms of fighters - bms related
additionally could also tag breakcore optie short version, the ranked maps of this song have it included as well