As long as each detachment (in this case patrols) contains only units from the same sub-faction (wych cult, kabal, haemonculus coven) or mercenaries (scourge, incubi, mandrakes) then each detachment can choose an obsession
So your kabal patrol could have the poison tongue obsession and your wych cult patrol could be cult of the red grief obsession as long as the above post is true
Ikol Wych
Posts : 571 Join date : 2017-03-20 Location : Perth