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Khorne and Tzeentch have unique Chosen monstrous cavalry through Skullcrushers and Doom Knights (Doom Knights aren't really monstrous cavalry, but you get my point). I hope Slaanesh and Nurgle will get a similar type of unit. For Slaanesh maybe Chosen on Slaaneshi snake daemons (I don't know what they are called), and for Nurgle Chosen on Rotflies or on Rot Beasts.