Ok! You wanna spawn boxes that attack the player 
Gimme a little while…
Ok, sorry about the delay. Here’s a proj that spawns green cubes at random locations that attack the player. If the player gets them in time, then vanish, otherwise they harm the player ( simple because I see you have the explosion thing nailed ).
https://drive.google.com/open?id=1Nd0qpxpaeTzqf7GJ7chol9N9p8bJSYWA
yeah that boxes are attacking the player and yes I will see your project if it will help me that will be great otherwise I will contact you soon
by the way sir you are a legend and an explosion can be done if we shoot green box in your project