Alligator scute is the bony plate of armor on the alligator that makes their skin difficult to penetrate.  Likewise, the metaphysical power of scute provides an organic field of protective energy that naturally drives away those who seek to do harm.  The scute is a supernatural barrier that repels psychic attacks, deters others from casting against you, and blocks the natural, negative energies within the world from penetrating your atmosphere and causing negativity to breed in your life.