There was a pair consisting of an angel with a single white wing and a fallen angel with a single black wing, both called Yuzel. Many assumed them to be distinct entities, yet nothing could be further from the truth. Though they possessed different bodies, they shared the same mind. Since antiquity, they had used their superior divine powers to control the standards of morality, placing them far above other angels.
Added on March 9, 2014 as a part of Archer 4 Card Pack.
Equilibrium is a condition in which all acting influences are cancelled by others, resulting in a stable, balanced, or unchanging system. Or mental or emotional balance; poise, composure.