Camouflage

From Ardrana

The camouflage spell functions only in wilderness settings, allowing the caster to instantly and completely hide a number of people, concealing them against even thorough searches. The spell changes the coloring and shadowing of the affected individuals to blend in with the natural surroundings. It is effective even against infravision and ultravision and is especially useful for scouts and infiltrators. Spell-camouflaged individuals retain all their faculties and abilities, and they can emerge from the magical concealment at any time they desire.

The concealed individuals can move while magically camouflaged by creeping slowly up to 10 feet each round. Trying to move faster than this dissipates the spell. As long as the movement is surreptitious and stealthy, the spell holds. The concealed individuals cannot be detected except by magic or by moving stupidly. Until the spell wears off, they enjoy near-total invisibility.

Note: This spell originally appeared in this form in The Complete Book of Elves for the AD&D game from TSR. Its use here is for the purposes of providing context for the campaign only.