from above, a Dreadnought CAN NOT move out of HTH with Monstrous-sized creatures, only Man-sized or smaller.(posted 9353 days ago)Lictors work well, yes. DO NOT underestimate the Biovore and Spore Mines!
A spore mine has an average of 17 for penetration, so you don't have to roll too well to get the legs or rear body. Then the continuing damage can really wipe him out!
I had a Spore land on a Dread, penetrate the legs, rolled a '5', Fall Down, go BOOM!