Hey there @Hector40! By disappear, what do you mean? Do you just want to destroy them?
If so, the Destroy Actor node is what you’re looking for! Though you still need a means of calling it from your player’s death event, and for that I just answered a question on my recommendations on how to do that!
To get all of the enemies without casting to them, I just answered a question of how to call the same event on all enemies over here!