The caster weaves together the illusion of a particularly keen-eyed ranger from the fictive elements of Air. This individual will appear to act as a guide or watchman until the setting of the next Blue Moon. Although lacking the reality, this can be an effective deterrent for many would-be thieves or ambushers - at the very least acting as a potential target.
As a relatively weak illusion the ranger lacks flexibility outside of the specific role of keeping watch, and will quickly fall apart to disbelief in most other circumstances.