The unicorn symbolism is all about the identity of Christ, the anointed one, whose power came from being raised from the dead. It is about our identity of being like Him. We have been chosen and anointed, set apart, to do good works. The horn represents the power and authority to destroy the works of the enemy. It's about coming fully alive in our unique identities that He has created in us by throwing off every restraint that would try to control or hold us back. This unicorn line is about fully walking in His freedom and power!
The Lord is my rock, my fortress and my deliverer; my God is my rock, in whom I take refuge, my shield and the horn of my salvation, my stronghold.
He has raised up a horn of salvation for us in the house of his servant David