User blog comment:FairyRaven/Fairy Tail Chapter 440: God Serena, Review and Commentary/@comment-4933386-20150615090755/@comment-4933386-20150616034647

Oracion Seis is the members that is organically linked with Brain; Angel, Hoteye, Racer, Midnight, Cobra and Brain himself. Klodoa is a member of the Oracion seis is just a equipment that Brain uses.

I know Oracion is the whole guild, but it's meant to be for the six prayers (as mentioned above)