I think that its a form of energy that either takes the form of bees or Combees.
Now that you mention it, I remember in the show that Attack Order came out of the combs on her bottom (hehe). If the attack worked like that, I think it'd be neat if Attack order summoned energy bees that kind of scratch and sting and kamikazee on impact with the enemy.
Really wish I had thought of that before I drew my sad attempt at a Vespiqueen's Attack Order attack
I'd have to say that Attack Order would look better as a bunch of dots of energy swarming together like bees. A bunch of combees would look big and rather intrusive considering the size of Combees. I think they would block out a large area in a drawing and would look awkward while chasing someone considering how blocky (hexagonal-y?) they are. If they were actual bees I think it would be kind of weird... lol
Oh and Rupert was also mentioned in this bio. I think you should put the link down here considering that you put Matthew's.