They say urban terrain is the hardest for a military to clear, they are wrong. Urban terrain has an intelligent lay-out to it, ruins, however, do not. Either by time or man, structures are rendered a hap hazard mess of open spaces, corridors, dead ends and sudden drops.

In Vietnam, they called them Tunnel Rats that cleared out VC tunnel complexes, singular men armed with only a pistol and their wits. The same applies here, though I'd prefer Ruin Dragon, hehe.

Dragon : Me!
Artist :  lethal_doors