Somewhere around the 7th min of the episode, we see Davina braking Klaus' compulsion from Cami. At that time Josh hands over her notes and get burnt by the sun rays coming from the window. Davina says:
"I promise, as soon as the world stops hunting me, I will find a daylight ring spell."
That raises a question though:
If Davine is not capable of making daylight rings... Then how come Marcel's daywalkers have one? Considered in an earlier episode we had Marcel organising a fighting-event, whose winner would join the inner circle and get a ring (before Klaus and Elijah spoiled the fun), we can say for sure Marcel is giving dayligh rings up to today. It's not like all his daywalkers are from a 100 years ago or something like that. So, if Davina didn't make those rings, then WHO DID?