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This question came up in my game last night.

Played my Chaos Knights vs my buddies grey knights, and I chose the secondary "Abhor the witch" as one of my three (as why the heck not, and none of my knights are psykers).

I have 85 reinforcement points in my list, so during the game, I summon a changecaster (which is a psyker).

Does this prevent me from being able to use that secondary? Or, because I have the ability to summon a psyker (which isn't part of my army-list) can I not choose it?

There is no requirement on an objective to be selectable throughout the game therefore it is legal to select as it meets all requirements at that point in time.

As long as you do not have any PSYKER units in your army when you select the objective you are good. Anything you summon later doesn't count because it doesn't exist yet, and nothing says that you somehow lose access to this objective if your army suddenly gains a PSYKER.

Okay, that's what I thought, thanks!