The druid scimitar runes thing is really cool, if it's true and he didn't make it up cause I'm definitely not willing to put in the time to debunk!
I also liked it. Will watch the rest of his videos. Thanks for making it, and to the op, thanks for the link.
Sings: Living in a mystery. Very creative. That is the spirit of adventure in part. Druid rings I will give you the answer: Sinister to express a darker purpose, undead present, because they are a place of sacrifice. A towen. The magic comes in part from sacrifice. Its common knowledge, even in the kingsquest light hearted series, see the rain ceremony in kings quest 5. They were going to sacrifice Alexander. There you go, the darker side of real druidism historically. Base Nature includes, death and renewal in that context. A cycle. Sacrifice to those that embody and are beyond the cycle. The gods. The ancient druids saw it as a symbolic act in representation of an actual cycle and to express the system of the natural order and its workings. In fantasy, the symbolism was taken as literal to be colorful. So abandoned druid rings would be creepy places.