Some illusion spells inspired from an old 4e Ars Magica spell list with revisions as I didn’t follow what the old spell actually intended.
Illusion of the Patrolling Guardsman
Creo Imaginem 15, R: Touch, D: Sun, T: Individual
Makes an image of a clothed and equipped person that can make noise. When cast the behaviour of the illusion is decided. The illusory person can move about, speak, and behave as a human does.
(Base 2, +1 Touch, +2 Sun, +1 move in a prescribed manner, +1 intricacy)
Very similar to the …Phantasm of the Human Form (CrIm25, Ars p.144) the material difference here is that the spell is designed to allow a fixed path and action and a range reduction.
Illusion of the Frozen Guardsman
Rego Imaginem 25, R: Touch, D: Sun, T: Individual
The target’s image appears to be doing what the caster desires, while the target separates their physical actions from their visual appearance. The image will not reflect the target’s actions unless it is returned to overlapping their body, or by the caster concentrating. The target can move up to 100 paces away from their image.
(Base 5 for up to 100 paces away from the body, +1 Touch, +1 for an additional sense, +2 Sun, +1 Changing image)
This spell allows a guardsman to appear to be standing still while they wander elsewhere, which has advantages for Magi and companions alike performing covert actions within plain sight.