New category includes use of massive swarms of autonomous intelligent weapons (such as drones) in the numbers od millions up to billions.

High

New generation of the military hornets, see Black Hornet Nano - Wikipedia I weights only 16 g.

Now suppose that you prepare ship with 160,000 tonnes of these hornets - you have 10,000,000,000 them on the ship. And you start attack with them (version: personal killers) against people or in better case against warriors and their weapons.