I love a duplicitous game, - thought herself deceitful since trespassing in the Basin; also was dishonest when she told Windwalker she loved him.
That starts in the skull, - she created an illusion in her mind that she betrayed the Throat.
And ends in devastation. – built up internally until she cried at Midas about it all because she’s mature like that.
Hidden in the iron – colour reference
Tenebrous, shrouded. – Personality reference, she can be very gloomy and guarded; colour reference, possibly; also a reference to the cloak she wears