Earth Magic ideas ??

I go simple here… what’s the best way to do a Ground Slam, I mean, imagine a strong guy…he is angry and then…smashes the ground making a straigh line of rocks pulling out of the ground like a badass. Sorry for my english, I am trying my best :stuck_out_tongue:
If I instantiate a “rock” that instantiate another and on and on … how can I set a limit for this ??