you can make it so you place a ward that looks like a grenade, give a 2.5 second life, and give it the abilities AoE damage upon death (Big Mine), and locust. You can edit the AoE damage upon death thing to make it do more\less damage, have a larger radius, work on items trees and friends, etc. I tested it myself, it works almost perfectly. The one thing is if you want to show the projectile, then you need to make it complex.