BoM/TWS Message Forum

From the wiki:

"The Libra spells are designed only to work on humans by checking for human essentia before executing. Removing or modifying this part of the sigil would allow the copying/disguising of other objects, including animals, plants, clothing, furniture, etc.

Masks could copy animals or plants or pieces of furniture, or be placed upon them, if the sigil were suitably modified so that it accepts certain kinds of bodies as receptacles. Animals (and other items) could thus operate as golems by hanging human masks upon them; and if the mask is a mask-golem [i.e., a mask with the magician's essentia painted into it via the 7th spell] then there would be no difference between putting the mask on the animal or on a golem. If it's a regular mask, however, [one without the magician's essentia] the result would be a free golem disguised as the person who was in the mask. If placed on an animal, the resulting golem would act just like the person in the disguise, but they would also have the animals memories, and maybe some of its dispositions. Most likely, though, those memories would be vague and haphazard, and the dispositions would be swamped by the much more complex dispositions of the human. But it could create unwanted and unfortunate confusions."