User blog comment:Nomad27/Summoning in the New World/@comment-33177490-20150723163304

I'm speculating that the Slane Theocracy must have used their WC item: Downfall of Castle and Country to brainwash Angels from the New World. After that, they probably sealed all the angels away inside some sort of magical crystal through performing multiple rituals. And this magical crystal has the power to signal commands from the monster you summoned I'm assuming.