Brotherhood of the Yellow Sign
If there is one thing known of the Brotherhood of the Yellow Sign, it is the destruction that is left in their name. Entire cities have been wiped out by a three or four of their followers. Only a handful of people know of the Brotherhood and even fewer know how they have infiltrated Khovaire’s society. The Brotherhood keep themselves shrouded in secrets as any followers that are captured promptly commit suicide.
In general, the Brotherhood travels in packs of three. The skills observed in battle by those that survive suggest that one is a more powerful mage with the other two being apprentices. When the leader has fallen, the two lackeys will flee if possible. It is also known that they will travel with byakki.