AI characters instantiating / chasing

A gif of enemies chasing my protagonist:

A gif of enemies being instantiated by clicking the mouse button (movement with LMB, spawning with RMB):

If you're wondering why the terrain looks different, baking a Nav Mesh on my crappy laptop with a giant piece of terrain took forever, so I eventually deleted it and replaced it with a smaller, meshless terrain for the purposes of getting this to work in less than 10 hours.