Since this is such an expository strip anyway, I'll mention that the things in the centers of Hector and Kay's collars, along with Master Cedric's collar earlier and the clasp of High Priestess Zhana's cape, are holy symbols of Elaynia. A holy symbol acts as a sort of "lens" that a cleric can use to turn mana of the mortal realm into a magical conduit for their god's will. In other words, clerics use holy symbols to cast divine spells. I stole that from D&D too, but I put extra effort into explaining how it works.
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