[@Vesuvius00] Woohoo looks awesome!

Some great questions about the creatures. After a bit of gameplay and some rehash of what's needed, here's how it's working out:

There are several levels of daemons. The lowest, weakest ones exist just barely under the edge of our reality. Essentially they're just invisible monsters that otherwise exist in our world. They're affected by nature, can ransack caravans and make footprints, and can be hurt by conventional weapons. 

The more powerful daemons exist on planes farther and farther away from our own, and have less and less to do with our reality. The most powerful ones can't see or interact with our reality at all, except with the Echoes. These daemons can't be simply captured with a tossed stone, but must either be half-dead or willing to be captured. The only ones that can hurt them are other daemons. The only ones that they can hurt are other daemons. And Echoes, of course.

The MODO exist in all the planes at once, and can freely move back and forth between our reality and the most distant existence. That's what makes them dangerous and unstoppable.

I hope I'm making sense, haha. xD