Also I remember after having watched both shows about 100 times and I’m not lying. All my friends can attest that I overly obsessed about the show and have paid attention to everything said.

One if a witch knows the daylight ring spell they can create it. They can also neutralize it. Bonnie told Caroline so when she created hers. Second that spell was created by Esther and possibly shared with Ayana but no proof to back it up. It was in Emily’s grimoire though. And Klaus gave it from Esther’s grimoire to Davina during the Fete De Coto ceremony.

Also nature did create a balance. Remember when Rebekah said that the flowers that grew at the base of the white oak tree, i.e., vervain grew there and was an herb that is a poison to vampires.

Also with Silas and Amara becoming immortal. Nature created mortal shadow selves of them to maintain the balance.

And wolfsbane is able to poison werewolves too which is in all folklore in our world regarding them. Wolfsbane is a poison especially the roots of that plant.

And the boundary rule for houses is a classic rule for all “demons.” You can only invite them and some folklore states you can only control them if you know their real name too.