Equip the Dummies and Bots shard on your boots
Use Death From Above
Switch to another hero while in air(or rather any time before the decoy explodes)
Rinse and repeat and you'll get this
Extra: The shard I was using wasn't upgraded once
The spawned anti-grav bots do not detonate each other as they are recognized as different groups of fourExpected Results: The picture above, a ton of anti-grav bots laid ready for explosive action.