Goetia - S. L. MacGregor Mathers (1904)
The Sixty-seventh Spirit is Amdusias, or Amdukias. He is a Duke
Great and Strong, appearing at first like a Unicorn, but at the
request of the Exorcist he standeth before him in Human Shape,
causing Trumpets, and all manner of Musical Instruments to be
heard, but not soon or immediately. Also he can cause Trees to
bend and incline according to the Exorcist’s Will. He giveth
Excellent Familiars. He governeth 29 Legions of Spirits. And his
Seal is this, etc.
Pseudomonarchia daemonum - Johann Wier (1583)
Amduscias a great and a strong duke, he commeth foorth as an
unicorne, when he standeth before his maister in humane shape,
being commanded, he easilie bringeth to passe, that trumpets and
all musicall instruments may be heard and not seene, and also that
trees shall bend and incline, according to the conjurors will, he
is excellent among familiars, and hath nine and twentie legions.
Dictionnaire Infernal - Collin de Plancy (1863)
Amduscias governs twenty-nine legions. His true form is as a
unicorn, but appears as human form when summoned. He will give
concerts if commanded, & is accompanied by the sound of trumpets
and other musical instruments. Trees also bend to his command.