How to force AI to don't walk in certain areas?

I’m sorry I don’t have the add comment and can’t even vote or set an answer as correct, it tells me request method not allowed… I can’t on all of my topics but can on others. Whatever.

How do I set the cost in value? All I have is Obstacle, Lowheight and Null cost, Obstacle works, I’ll have to add one under every light, and switch between obstacle and default depending if lights are On or Off. I don’t know about performances because I’ll have to set my navmesh generation on dynamic.

And I can’t set it with the glowstick because I can’t guess where it’ll land, I simply need to find a way to tell the AI to move out of its radius.

I’ve set a light trace by channel in the lights/glowstick BP’s, I wonder if I can use it to set the whole thing up,