Its gotta be beast for sure

A Reticence Betrayed - Beasts Kind heart was betrayed and he was set loose.
The Ether Decayed - As in saying the cure is vanished * for now *
Halcyon Waylaid - The Calm heart of beast was attacked by
Erroneously Portrayed - Falsely Portrayed or in other words Falsely Defined. Beast is falsely defined by his appearance. He is really a prince but looks lke a beast.