How does the infliencal people of your world defend against superpowered assassination attempts

I guess it depends upon how good your magic system is at stealth, in my system world magitech is used that can easily detect even the smallest bit of fluctuations in the atmosphere to detect assassins and hell they can even detect them even if there are no fluctuations depending on how good the creator of the tech was.

However assassins worth their salt somehow even transcendp this and it's basically impossible to detect them without some very extreme tech which I think only very few people can keep around(it's not about money) so personally stealth build is kind of busted in my world how do you guys deal with super stealth assassins ifbyiur world how are they countered and how busted are they?

To clarify stealth magic works by continuosly applying magic that makes your body undetectable this means photons hitting your body gets manipulated so that they don't show your body and the slight sound waves or air that gets displaced by you gets muffled too, so that's how stealth magic works and yes I know it's kind of like cheating basically so I'm at loss here as to how to deal with them, like there is no way these guys wouldn't be widely utilizes i don't want my world to become Skyrim overrun with stealth archers.