two voices will call out in silence that all will hear

Want/need aka the balance for free will of choice. Silent; yet demanding (adaptation).

idols will speak and move about

Words as the suggested idolization of meaning (spell-craft) and us consenting to speak and move by them.

the star will gorge itself on clay

Golem aka the monster out of clay; controlled from outside...an allegory for deceiving free will to submit to the suggested words by the free will of others; who in return can speak "in the name of" the believed meaning of words. The star gorging itself represents our favorite parasites exploiting the ignorance of the many with all the chutzpah they can muster.

a killing bolt will shine in the night but will not kill

Flow offering inspiration to the ignorance of form...flow kills form; yet also represents the source of inspiration needed for form to sustain itself by choice of reaction to flow.

an island will drift away

Form (life) within flow (inception towards death).

three branches will become one

Understanding of male; female; child representing ONEself in blood.