future battlefield

What's the most powerful weapon?
It must be a #bionicrobot# weapon
for example
Bionic robots can burrow into the soil like earthworms => ambush in advance
Can also be like a butterfly => ambush in the jungle
You can also be like a shark => destroy the opponent's warship in the sea
You can also be like a spider => sneak into the opponent's headquarters and assassinate the enemy general.
..
Make enemies feel scared when they see animals