Since the rp is 18+, do the character need to be as well?
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Ah, well yeah in this case it would be another Plane, at least as I'm determining it here. This was written by someone who was just making their own CYOA and lore, so it probably won't fit entirely perfectly if we go into what makes each function. Especially since I don't know all of what makes the Verse he comes from run outside of minor mentions in the CYOA itself to creation energies, along with Ad and Sub Deus.
Whatever either of those last two are.
Good thing I didn't make one of his goals Amaranth then, because as far as the author of the CYOA intended, that's actual omnipotence. Like, no limit, and since it's described as a level of power beyond what a Living God currently has, I could easily see it being him ascending to that higher Scale you mentioned. At least in this case, since the author says all narratives and stories are yours in the description of it.
But uh, he ain't geared towards that, so.
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They are the same thing, but using different terms. The author of that CYOA essentially intended for Verses to be their own Existences containing omniverses and such along with our own universe from what the lore they wrote says. I will point out that since Zachary has Anarchic Verses on his sheet, it naturally implies the existence of many other Verses and Existences, not all of which are necessarily similar. In Zachary's case, his Verse or Existence does not have any of the OCs or organizations from MR, merely official works like Marvel and such, along with some organizations found in the CYOA.
Essentially, his Verse is another Existence in the Outside, it's just different in terms of structure, contents, and referential terminology. That's how I intend to make it work, and honestly how it most likely would given how closely the CYOA author's lore and the lore you've made here align.
I should also note that since he's the only Living God as far as we're aware, in this roleplay anyway, that only he knows for sure out of everything in his Verse that other Existences are real. Since he's the only being from his Verse who operates at a level beyond it and all other than the Entities, who I just assume are so batshit insane they can't do anything with such knowledge. Course wanting to live a normal life means he didn't tell anyone a damn thing before he left to come to the one Myriad Reality takes place in...
Another reason I stress reading his sheet is so I don't have to explain something twice, and also so no one gets upset if he does use his powers. I've had this happen before mind, where some lazy twat doesn't read what my character can actually do and then gets pissy when I proceed to do said thing.
I really don't want a repeat of that, especially not here, so please take some time to read his sheet and then the CYOA authors lore on what a Verse is. That way you know who Zachary is as a Living God, and the scale his powers actually operate on. Like I'm not using his full might because that doesn't fit him as a character at this point in his arc, but what little he can use is still extremely broken, and I'd prefer you know that beforehand so no ones fun gets ruined.