Weirdomancy is the magic of modifying other magic.
- Special Alteration
- Temporarily add and remove "natural" magic and abilities from units. (such as the ability to Move through the air from flyers).LIAB 33b
- Anatomy manipulation
- Alter the anatomy of some units, such as making Gumps grow radishes.LIAB Text 55
- Cancel, counter, or otherwise undo other spells, as in the Weirdomancy component of Dismiss Perfect Warlord.Hvs.tCF 37
- Can tweak and reweave existing magic, such as scrolls.
In simplest form this could be increasing rate of movement, and reduced or eliminated penalties for any Terrain Type, possibly including moving through walls. These would also fit the name since a unit that could move twice as fast as it should straight up a mountainside and through the walls of a city would be weird.
Conversely, it could also reduce movement and increase movement penalties for a side's enemies, with similar combat applications.
It is also possible that at a higher level this magic can perform ultimate movement tricks such as teleports which put the target unit in a different numbered hex.
It would also be possible to summon units from a distance including other planes, but this does not fit with the only summon seen so far - the Summon Perfect Warlord Spell.
If Weirdomancy does affect movement and stats in addition to natural abilities, then it can be considered 'weird' that such seemingly disparate effects are collected within a single discipline.
Another possibility will be Weirdomancy to affect the shape or composition of objects or beings, including their biology, giving, for example, the flying special to a unit by making it grow wings.
The Museum of the Weird contains Wax Figures (which would be Dollamancy), but also Monsters, Shrunken Heads, Freaks of Nature, and Giant Lizards. It also contains Mythical creatures such as the Fiji Mermaid and Bigfoot. Supernatural figures such as Vampires, Mummies, Werewolves and Ghosts are also covered. Generally, Weird things include all that is Unexplained. It would not be surprising if Weirdomancy includes these things.
"Weird" has also been used to describe witches, warlocks, and sorcerers, so it is possible this is a broader discipline than has been shown in the stories so far.
The term Weird Fiction is a phrase first coined by H.P. Lovecraft as a genre name for stories written by him and others. Included in this genre is what would today be called Cosmic Horror, as well as Sword and Sorcery.