Do you GM's feel the following is legit use of Magick Sight or does it fall outside the realm of what it can do?

I want my bright wizard player to be in a room full of cult artifacts, one is a mirror that has a normal reflection. But when he uses magical sight the reflection in the mirror is revealed to be a portal that shifts to different locations, at first he observes a room on the other side, then it shifts to a Slaanesh priestess that is looking right back at him from the other side, and casts Enticing Dellusion on him and beckons him through the portal. Is the portal being viewed only through magic sight 'fit' the world?

What I see is an illusion covering the mirror so people do not see what is being truely shown. Which is Ulgu, the Lore of Shadows, which is studied by the Grey Order of Wizards. Chaos sorcerers, Slaanesh being one, also have access to this wind.

I think it depend on the wizards school what they can see. But from what I can gather Celestial Order can see Azyr to divine the future, so the other orders can also see their own wind colours as well. I think I read a story recently that showed ordinary people feeling the effects of an invisible mage battle, but not seeing anything.

I dont know if wizards see other winds, if they do then the reponse be different

You could have various degrees of sight, lowest being they feel a strong presense of their wind in the area gathering around the mirror. To their concentration being so that they precieve an illusion hiding the mirror and its true vision. Giving some form of bonus to a grey wizard.

Once they know theres an illusion then they can dispel it. Maybe to see the true image without dispelling it there could be an item the cultists wear that gives them this sight. A strand of grey magic linking the item to the mirror. I doubt a chaos sorcerer would let anyone with mage sight be able to just see what they wish to hide.

These are just my ideas,

My take..

Free magic sight would just see "something odd about mirror, it's magical or has been enchanted or something".

1D check would likely just perceive "it's not nice safe single colour magic".

2D check would see the dark magic for what it is and at that point might then perceive the "truth".

3D success would understand more of how the mirror works, and in addition to seeing the image etc. would grant boons or other aid on not falling afoul of it.

Chaos Star on any check and nasty stuff….

So I thought about this some more. To answer your question simpily, yes it is possible.

From your question, mage sight would let them see depending on difficulty, There are spells in Warhammer that let you see things that magic users cant see with your eyes. So it is possible for what you described to happen.

Go with what you feel is right, the winds of magic are very powerful. I think literally, anything is possible. I remember years ago reading a book where a man met a law daemon who changed the world around her to be more orderly by the use of magic.

Thanks for the input guys.

I am also disappointed in Enticing Delusion, it is not very clear about what it can make a person do, and I wish it allowed a more lengthy seductive control. As it is now, she can only control him for one or two maneuvers and then it is broken (5 power and 3 recharge before it can be cast again i think). I wish they had more powerful spells that would keep him under her charms for a longer period.