Think of Team Fortress Classic or CS 1.6 or even an old version of Team Fortress 2. I think all of them used Miles sound system or Speex (old version of opus). Here is an example to remind you https://www.youtube.com/watch?v=3dyQlZziHnw

So i'm working on a zombie survival type map where you last as long as you can, and the main goal is to stop them from destroying one specific func_breakable. I've already made them spawn infinitely, but how do i make them go towards the brush and attack it?