Vow of the disciple has a symbol shows up on a board at the end of the first boss fight which is believed to tell us about light fall but you only see one per team complication of the encounter but most of the board has been filled by looking at streams of the day one raid teams. the symbols tell us hive & scorn love darkness, worship the witness, pyramid fleet enter earth stop guardian, witness communes with traveler drinks light, witness kills [blank].
we don't know what the last symbol is could be. "Edit note" there are only a few symbols that it could be out of all the raid symbols, I could be something serpent from it that's why it is blank