Dig Lord first appeared in TRO: Vehicle Annex, then against in DATP: Vega along with an armed variant. Deep Lord was first in an XTRO, I think Periphery, and then a refined version is in TRO: Prototypes. While technically a civilian unit, the original is one of my favorite things to sneak into a force. People ignore the 'puny' IndustrialMech, but then there's the screaming and the greasing, the burning and everyone's on acid and can't see becuase Zoidberg got ink in their eyes, and then sombody's gotten their hand lopped off and the Dig Lord of the Sith is the father...