Infrainvisible

The infrainvisible spell masks the heat signature of the creature touched, causing it to be undetectable to infravision, although still visible to normal sight. Note however that light and very hot heat sources (such as fire) never become infrainvisible, although a source of light or heat can become so (thus, in effect creating a light or heat signature with no visible source). The spell remains in effect until it is magically broken or dispelled, until the priest or recipient cancels it, until the recipient attacks any creature, or until 24 hours have passed.

Note: This spell originally appeared in this form in Demihuman Deities for the AD&D game from TSR. Their use here is for the purposes of providing context for the campaign only.