The first monasteries focused on the Shadow Dance, the most elite becoming Shadow Dancers, tapping into the essence of the Shadow World, one of the spiritual barriers between the mortal world and The Nothing, the world beyond to which all dead souls travel. Adherents of the Shadow Dance thus tend to be a little morbid, focused on death, oblivion, and shadows. Given that Djihon spirituality involves ritual sacrifice to the Serpent and a heavy emphasis on the afterlife, the shift in philosophy was a relatively easy one.
After the monasteries started accepting students outside of the former slaves, other beliefs and philosophies began to creep in to the teachings and eventually new monasteries with different outlooks started popping up. The root teachings still have a heavy focus on a life of balance and moderation in this life to prepare one's soul for the next, but each monastery branches out in its own way from there.
It should be noted that the most powerful of the Shadow Dancers were among those who worked to repair the barrier between worlds that was torn asunder during the Shadow War, sacrificing themselves to give their soul energy to the Lord and Lady of Shadow to seal the gap. An obsidian obelisk, a monument to their sacrifice, stands in Silvergard.