I am back in Warhammer AoS! I started years ago with Slaves to Darkness (i.e. chaos marauder and few Chaos knights). However, I couldn't resist to buy the start to collect Daemons of Slaanesh (with some daemonettes).
Thus, I was wondering: would it be possible for me, if I want to use Slaves to darkness as main army, to use the daemonettes of Slaanesh in a game (with official rules)?