The purpose of this spell is to make the victim believe that an item is something else that it really is, while all other peoples perceive it normally.
Celtic Druids and the Tuatha de Dannan
By Dominique Crouzet
Illusion (Phantasm) [Mind-affecting]
Level: Bard 4, Sorcerer/Wizard 4, Satire 4
Components: V, S, M
Casting Time: 1 full round
Range: Close (25 ft. + 5ft./2 levels)
Target: 1 item of tiny to medium size
Duration: Permanent until discharged; then 1 hour/level
Saving Throw: Will disbelief
Spell Resistance: Yes
The spell is to be cast upon an item the caster wants to alter in the perception of the first appropriate person seeing it. The caster thus first determines who will be subject to the spell. This may be as vague as -any humanoid-, or as complex as ·an albinos half-orc in full plate armour·, or keyed to a specific individual through the use of a lock of hair, nail, etc. from that character. Thereafter, the first person conforming to the trigger’s specifications, who gets by the item (seeing it, touching it, etc.) will be affected by the spell. Then the caster determines how the item will be perceived by the victim. So the light clothes of a prostitute could be made appear as a rich ceremonial robe; a club like the sword of Selthor; a blank parchment as a magical scroll; etc. The alteration may be even more drastic, as to make the light clothes of a Shiranese prostitute appear as the sword of Selthor. However the Will saving throw is dependant upon the correlation between what the item really is, and what the victim is to perceive.
That is, the victim will be entitled a saving throw for disbelief only in cases of non correlated interaction with the item. Wielding clothes as if they were a sword entitles a saving throw for disbelief; not wearing clothes altered to appear as another sort of garb.