Check for Black Mask at a point

[Death[CrAb]]

Hello, I have been trying to check if the target point of a blink ability is covered by black mask, or is it explored (but not visible). I have disabled the blink ability's Test Fog option because it prevents the unit from blinking onto explored areas, but I still want it unable to blink into unexplored areas.

I have tried the validatiors, but have been unable to find a way to check for Black mask.

I have also tried the triggers, but there doesn't seem to be a condition that allows me to test a point and see if it's explored or not.

Can anybody provide some assistance?