If you've made it this far, I trust you've explored all the miniatures galleries and are now a trusted son of Caliban.

 

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You are then granted membership in the Inner Circle of the Chapter and can be made part of our darkest secret:

 

  At the end of the Horus Heresy, some brothers fell from the grace of the Lion and consequently from that of the Emperor of humanity.

  To this day, it is our sacred duty to search for them in every corner of the galaxy and bring them back to our fortress-monastery so that they can repent and end their days purged of their sins.