The following was taken from the Icarus Foundation’s Research and Archive Department. 

If the Cabal is the heart and soul of The Book of Cademus then the Knights of Cademus are it’s fists. They are a highly trained secret army. Their sole reason for being is to protect and enforce the doctrines of as laid out by the Cabal by any means nesscessary.

A member of this secret army has a small tattoo, which decorates the inner part of their right bicep, just below the armpit.