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If I have a primary detachment of Necrons along with an allied detachment of Chaos Marines, which includes a level 3 sorcerer and decide it would be fun to summon some chaos demons to the party, do I have to make 'One Eye Open' rolls for the necrons and the demons once they are successfully summoned? Or are they just freebees with no problameos?
Same situation with Orks instead of Necrons too.
Thanks.

The alliance matrix still is in effect so yes you'll need to make One Eye Open tests