Proposed Canon
Since "Erf" is the name of the world, much as "Earth" (which is another word for "dirt") is the name of the Real World, then being the magic discipline which is closest to the physical "stuff" of the world, Dirtamancy is the magic discipline that has the most impact on the physical in the land of Erf. It is apparently a rare discipline and highly valued around the Magic Kingdom. Conversely it seems to be under-appreciated outside of the Magic Kingdom.
Moving and digging through solid stone.
- Dirtamantic Golems
Can construct, demolish and upgrade: Traps, walls, tilling gardens, digging foundations, making stone paths, tunnels, drains, and sewers, etc. They can dig out structures underneath the ground they are walking on. They can also construct traps that harness terrain features.
- Fire Extinction
They extinguish fires better than other units and are the only units that can put out a fire that has reached Inferno status.
Can cleanse a unit of dirt.
- Matter Manipulation
 Known Dirtamancers
- Sizemore Rockwell in the service of the Plaid Tribe.
- Komatsu, of Haffaton.
- Joe Dirtamancer - Dirtamancer of unknown Side in the Magic Kingdom. Is Qualified to sit on an Enforcement council for the purposes of judging Casters who have committed crimes.
- Digdoug Mole of Homekey previously of Follywood.
 Dirtamancer Bonuses
A Dirtamancer is also known to give a substantial combat bonus to Dirtamancy golems under his or her command.
A Dirtamancer present in the city at the time of an upgrade also substantially reduces the cost. A Dirtamancer that is present when a city upgrades dictates the look of the city and the livery (if any) present within. First Intermission 25
As a form of Stuffamancy, Dirtamancy is aligned with Matter, but not with Life or Motion. However, most of the abilities which a Dirtamancer commands seem to allow him to either grant matter a magical substitute for Life (as in the creation of golems), or to involve the movement of matter, (such as in the construction of tunnels.)
 Natural Dirtamancy
The building and upgrading of a city is a form of natural dirtamancy, as is sacking a city by an enemy. Gobwins and Marbits may practice Natural Dirtamancy as they engineer in the ground, digging tunnels and the like, in addition to having tunnel-fighting skill.