How to make one object disappear once another is destroyed?

So I would like to make a gate, or a blocking volume, or door open once the boss has been destroyed.
Maybe there is already a tutorial For this, I am sorry if there is I am not seeing I guess.
Thanx In Advance.

I would recommend and event destroyed node in its event graph to trigger the change to something else. If you can directly link the other object in and destroy actor or set visibility off or whatever you want to do then you could do it directly, or maybe a get all actors of class if there’s only one of this other thing, or you could use an event dispatcher and just have your other actors listen in (this sounds like the option you’d most want here).