Envy

Envy is a construct of an Iron Lion created by Zybilna. He is part of an elaborate defense mechanism she created for the Palace of Heart's Desire in the event that she were ever incapacitated. When she is removed from the Palace, or slain, her magic summons both Envy and his counterpart Wrath from their respective demiplanes to the Palace's garden. There, the two of them form part of a three-part magical lock, along with a Crown of Golden Roses. Various doors throughout the Palace are locked and only able to be opened when the Crown is on the head of one or the other. The Witchlight Court was able to puzzle out this riddle and open the doors with Envy's help.
Envy and Wrath are very similar in personality, regal, haughty, and having nothing but disdain for each other. They are eager to help anyone seeking to save Zybilna, however.