"The prayers?" Hao Xuan frowned, "Where do the prayers come in?"
With a deep sigh, Vlitgar shook his head in obvious displeasure and started drawing on the mirror with his finger.
"These things, your mentor should have thought them to you brother. It is a great injustice!"
"....yes...it is..."
He sketched a VERY rough drawing which consisted of four squares.
He pointed at the first square, "This is a golem or a statue placed somewhere in the world outside, likely in a shrine dedicated to the Sanctum."
"Those who believe in the Old Gods can go to these shrines to offer their prayers or ask for aid. A shrine can have one or many 'protectors' that have a liquid metal base sealed inside of them. Once blessed by the prayers, these metals act as a doorway to the mirror world for the Ethyma to take charge."
Then he drew a circle over the 1st square and the 2nd.