Okay first of all, props, that's a really cool graphic. Simple, but elegant even if I don't remember some of the terms lol. These changes sound fascinating and have further piqued my curiosity.
Thanks. One very likely reason that you don't remember some of these terms is that they're new. Reniam was always just Reniam, but in theme with giving the planes "-realm" names I gave it its secondary name of the Corerealm. The Ether/Dreamrealm is essentially what was called the Spirit Realm in the previous iteration, and Stupor is still pretty much what Stupor always was: the space between realms. The Divide is also pretty much the same thing, with the main difference being that it is no longer between Reniam and Hell, but rather between Reniam and all other realms and keeping out all gods rather than just the "bad" ones.
Tidall and Drigall are both "new" in a sense, though there is somewhat of a relation between them and the old Hell and Heaven. Essentially in the new version, the creator spirits divided the gods and angels between those two realms rather than the "upper" and "lower" planes. The gods who vied for dominion over the other gods, Reniam and the "mundane" (the class previously labelled "mortals") became the Everbound and sent to Tidall the Everrealm, and the gods that fought to preserve peace and freedom became the Neverbound and sent to Drigall the Neverrealm.
The sun and moon are probably self-explanatory, but the Voidband is probably the most significant new addition aside from just the complete change of structure. You see, Tidall and Drigall are actually semispheres encompassing Reniam, as depicted, and can be seen in the sky. Not in the sense of "there is the crust of another planet outside the planet", since those realms are semi-metaphysical, but in the world the "stars" are powerful magical presences in Tidall and Drigall, meaning that in the space that separates the two realms there is a completely vacant stretch of sky at night that is just uniform black (clouds notwithstanding). I have a lot of little interactions in mind with this new mechanic, but among other things this new sky-structure has an easily observable effect on how Reniam sees the moon. When the moon shines through the Voidband it is white; when it shines through Tidall it is orange; and when it shines through Drigall it is green. The sun also takes on different hues depending on what it shines through, but its more intense light makes it somewhat less noticeable than with the moon.
There is one thing that still really fascinates me in particular about your world, and it's the idea of making bargains with Demons, for power and whatnot. Just the idea of having to go through a contract like a lawyer, and the margin for error (and the cost of such errors) being so high is absolutely intriguing to me. I remember I was going to do something with that in regards to Ilitas, but I'm thinking I'd design a different character, but keep that throughline since it intrigues me so much.
Heh, that one is hardly unique to The Prophecy, it's just an existing concept I adapted because it suited the Grand Master.
So that's where my brain's at. I'd love to hear some of the changes for various things. Like the Laws of Magic in particular :3
I actually don't think I've changed the Laws of Magic specifically, though I would have to check my notes to be sure. It's more that I've pondered the origin of magic quite a bit - where do spells come from? Why can spoken words invoke specific effects? That kind of thing - and addressing those unanswered questions made me reconsider some of the mechanical aspects of spellcraft. The short version is that internal magic (elemental, arcane, black (no longer called that) and summoning magic, as well as necromancy and the Art of the Warden) has become much more closely tied to the Dreamrealm.