A common element of several classic D&D adventures is a valuable object or treasure which is are disguised by illusion, so as to be hidden and difficult to locate by the player characters. This presents a problem in d20 System conversions, because no such spell exists in the core rules that actually does that -- "figments" (silent image, et. al.) cannot change the appearance of existing items, while the listed "glamers" (change self, etc.) generally work on creatures only. Listed below is the spell that we can deduce is necessary from these conversions.
MASK OBJECT
Illusion (Glamer)Level: Sor/Wiz 3
Components: V, S, M
Casting Time: 1 action
Range: Touch
Target: One touched object weighing up to 5 lb./level
Duration: Permanent (D)
Saving Throw: Will disbelief (if interacted with)
Spell Resistance: No
You make a single object look different. Similar to a change self spell, the apparent change is up to you, and includes only visual appearance (no tactile, auditory, olfactory, or thermal elements are altered). The changed object may seem to be up to 20% larger or smaller in any dimension. For example, with this spell you could make a sword appear to be a torch, a treasure chest appear to be a broken barrel, or a spellbook look like a simple skull. The effect is permanent until dismissed.
Note: Creatures get Will saves to recognize the glamer as an illusion if they interact with it (such as by touching it).
Material Component: Powdered chrysoprase gems worth 50 gp.
This spell is designated Open Game Content. Read the license here.