[HoneyBadger]

It's not a bad idea, RamsHead. I wasn't thinking that they'd be carrying a large amount of rocks though, just small bags of round pebbles to either release en-masse over a target (sort of a shotgun effect) at great height, or throw. Otherwise, they'd be naked.

Another idea would be to have them just drop chunks of ice, which would be hard enough for impact, from a few hundred feet in the air, and also shatter, causing spray.

Ceramic would work for this, glass would work-both to somewhat greater effect, especially if they were hollow and contained, say, poison caltrops or even ashes mixed with water (to get into the eyes), but ice would be far and away more available and more economical-infact, you could freeze all sorts of nasty things inside balls of ice-gravel would be easy, functioning as buckshot-or poison the ice itself, since sharp objects impacting on targets at great height provide an excellent means of injection, or both.

The ice could come in the form of iceballs, or just icesickles-which should come down straight, pointy end first, or else spin in the air, which is almost as good.

Even pouring water over a target would be effective, I would think, combined with Caelum's lightning spells, or a chilly day.