Another question. When does the controlled figure attack? Example scenario from last night's game: Slaanesh takes control of an upgraded Bloodletter that can take out figs before they can strike back. Tzeentch also has a Horror in the region. Can Slaanesh use the Bloodletter to take out Tzeentch's Horror before it can attack Slaanesh's figures? Or does Slaanesh have to wait until after Tzeentch goes to have the controlled Bloodletter attack along with any of his other figures?
I argued that Slaanesh acts after Tzeentch due to dial order regardless of whether the figures he is using are his own or those of another player that he temporarily controls. Others argued that the Bloodletter was still a demon of Khorne, regardless of being controlled by Slaanesh and so went before Tzeentch.
The controlled figure has the abilities it had before it was taken. The Bloodletter strikes at the start of the combat round regardless, then we revert to normal attack order. So yes, the controlled bloodletter could kill the horror before it could strike back, and at the same time as any other Bloodletters in the region
Also - I assume it was taken control of by the upgraded Keeper of Secrets, yes? Because Soporific Musk specifically states it takes control of a CULTIST