Invisible Wizard Ear

Regular 
Creates a Wizard Ear that cannot be seen without the See Invisible spell. Anyone who guesses where it is may still attack, but the cumulative modifiers from invisibility and its small size make it nigh impossible to hit.

Duration: 1 minute. 
Cost: 5 to cast. 3 to maintain. 
Time to cast: 4 seconds. 
PrerequisitesWizard Ear and Invisibility.

Regular 
Creates a replica of the caster’s physical ear, through which he can hear. The ear may move about without bumping into things (as if it had Sound Vision), though it cannot “see” more than the general size and shape of halls and rooms. This spell may be cast on an already existing Wizard Eye (regular or invisible); this does not change its shape, but allows it to hear conversation and other sounds.

Duration: 1 minute. 
Cost: 4 to cast. 3 to maintain. 
Time to cast: 2 seconds. 
PrerequisitesApportation, Far-Hearing, and Sound Vision.

Item 
Any painting or sculpture depicting a human ear may be turned into an immobile Wizard Ear, through which the holder of an ear-shaped amulet, enchanted at the same time, may hear regardless of distance. Each such Ear links only to one amulet, and vice versa.  
Energy cost to cast: 450.