These two have a little history, Changelink (a robot with the appearance of a Changeling) and Eclipse were good friends, until a tragedy causes Eclipse's death, Changelink to overcome the bad moment with the rest of his friends, wears his necklace ( with his amulet broken because of his death) and transforms into Eclipse to keep his friend's spirit alive.

PD: The design that I based on to make the Changeling, is made by Quver