Hidden Blades

Illusion (Glamer)
Level: Alchemist* 2, Antipaladin* 2, Artificer * 2, Bard * 2, Inquisitor * 2, Magus * 2, Sorcerer */Wizard * 2, Summoner * 2
Components: V, S, M (a shard of glass)
Casting Time: 1 Standard Action
Range: touch
Target: weapon or ammunition touched; see text
Duration: 10 minutes/level
Saving Throw: Will negates (harmless, object)
Spell Resistance: yes (harmless, object)
  You render a target weapon or up to 50 pieces of ammunition Invisible, granting the wielder a +20 bonus on Sleight of Hand checks made to conceal the weapon or ammunition and a +5 Circumstance Bonus on Bluff checks to Feint with the weapon or ammunition.