Wizard Ear

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. 
Prerequisites: Apportation, 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.