After all, there is a clan other than the Choco Knights. The Gray Warriors are a rather secretive clan, not showing themselves to the outer world, meeting in dark places where noone will suspect them. Only people which can be trusted to preserve silence will be initiated into the secrets of this group.
Here a small in-character description I made up:
Only little is known about the Gray Warriors to the outside world. It is only sure that they seem to be a sort of group. Occasionaly, they have been seen meeting in dark places by adventurers randomly coming by, but once disocovered, the meeting would have dissolved in no time and they were never seen at that place again. There are rumors this clan is in a secret struggle for the control over the whole world, although they have never been seen doing anything which would justify this suspicion.