That's an extremely good idea Ledious.

also, the scenery is looking awesome! is there a site or wiki yet? (I'd like to keep track of it).

How about a cannon, one that shoots a slower, slightly larger missile (dealing the same damage on direct hit?)... but leaves a sort of Vapor (Gas, Miasma etc) substance that lingers and deals low damage over time to things that enter it? Maybe Nano-Tech!?