Ummm here is cult from the wiki :
The word cult pejoratively refers to a group whose beliefs or practices are considered abnormal or bizarre.[1] The word originally denoted a system of ritual practices. The narrower, derogatory sense of the word is a product of the 20th century, especially since the 1980s, and is considered subjective. It is also a result of the anti-cult movement which uses the word in reference to groups seen as authoritarian, exploitative and that are believed to use dangerous rituals or mind control. The word implies a group which is a minority in a given society. The word was first used in the early 17th century denoting homage paid to a divinity and derived from French culte or Latin cultus ‘worship,’ from cult- ‘inhabited, cultivated, worshiped,’ from the verb colere 'care, cultivation'.
Cult seems to fit perfectly with Bloodmoon.
Oh and the Bloodmoon cult will probably have a new guild house in Terran very soon!
PS: I actually originally though about a secret society, but realized if it wants to thrive it must be open.