Yes crimson slaughter are battle brothers with daemonkin.
Automatically Appended Next Post: The
aos khorne stuff converts to daemonkin really well. I have done,
Lord = terminator Lord
Warriors = bezerkers
Marauders = cultists
Monster thing = hellbrute
Icon bearer = kharn
Automatically Appended Next Post: You can't rerolls a reroll alas, no point taking a spell familiar and balestar
Automatically Appended Next Post: Probably better off with daemonkin primary, ally cultists oblitorators and sorcerer.
Without daemon models there's no point in trying to summon stuff (tho the monster could be a Prince). Use your blood tokens for
fnp and extra attacks.