Moleman
A mole, by most accounts, is a harmless creature. A gardener might have an ankle scratched by one occasionally, but there are far more dangerous monsters in the wild. A mole has several characteristics, however, that may be of interest to an Arcanist. The ability to borrow quickly and to sense creatures through the vibration of footsteps are both be valuable capabilities.
Born in laboratories by infusing the chthonic abilities of the mole into human subjects, the resulting creature is an excellent sapper, providing for tunnels and undermining enemy fortifications. Their loyalty and eagerness to serve make molemen the ubiquitous servants of the Arcanist saboteur.