Here's a short update on something you'll encounter. Warp circles are simply teleporters that link two fixed locations. Only Baru and TheDave can activate these (either one needs to be in the party).
The destination is unknown, so jumping in one could throw you somewhere you didn't expect. Their main functionality in the game is to allow the party to quickly jump areas without having to do some serious back tracking. There are also quite a few secret warp circles. I'm thinking of making a system for creating these circles via rune chalk or something. I'll throw up an update if I come up with something brilliant.