Ghosts Speak Not & Patience

When Nathaniel Garro carried word of the Warmaster’s treachery to Terra, he also brought with him seventy loyal sons of the XIV Legion. Distrusted by their kinsmen, they languished in seclusion on Luna... until now. Amendera Kendel, once a Sister of Silence but more recently in service to the Sigillite, gives Helig Gallor of the Death Guard a new purpose, and a new duty – one that will ultimately see him reunited with his former battle captain on the field of war.

Read it because
It's a look at the Death Guard who were imprisoned after their Legion's betrayal, and at how service to Malcador changes those who fight for the Sigillite... for better or worse.