Sapper
Sappers are military engineers, skilled in a number of fields, such as making explosives, assembling artillery, and commanding engines of war (what they do almost as well as an Artillerist). Their particular area of expertise is the digging of tunnels, either to undermine walls or to gain entry to fortifications. Dwarven Sappers are widely sought after by the field armies of all nations and some successful Dwarven mercenary units consist exclusively of Sappers. Sappers who are members of a Dwarven army will always be members of the Dwarven Engineers' Guild, while mercenary units operating in non-Dwarven armies may or may not be Guild members.[1a]