Chivalry has been redoing basically every one of the loyalty feats to make them more in line with the Brand of the Nine Hells feat[s] from Fiendish Codex 2.
I think it came about after the idea was suggested to use the above in all of the redone Disciple of ... classes that he was making [and I made the Mephistophiles one (Proud)].
If he's redoing the Hedmonad for you, i'm pretty sure they'll get a sprucing too