So, I made a blog post about my overall predictions for an Ethereal closure, but nobody would see that. (i'm irrelevant) That's why this now exists.
Ethereal Workshop Wave 6
For the final E.W. wave, I'm predicting the Poison Quad and the Quint will come. Two monsters came every wave after Wave 2, I'm sticking to that. The Poison Quad would be a string instrument, while the Quint would be vocal, insturmental and percussive. (If you want to see more about them, look at my blog post: mysingingmonsters.fandom.com/wiki/User_blog:SacredCata/ethereal_expansion_prediction)
Ethereal Sub-Reality Islands
This is inspired by Neon Greeny's Micro Pocket Dimension, so credit to him with coming up with the idea first.
Accessing the Ethereal Sub-Reality
To access the Sub-Reality, the Quint Frenziaxis must be culminated and the placed on the Workshop. Next, you would have to click on it, select the transpose button, and you will be able to transpose the Single Element Ethereals to one of six islands, those being:
Plasma Jungle (Plasma, Shadow, Mech, Crystal)
Shadow Crypt (Plasma, Shadow, Crystal, Poison)
Mech Factory (Plasma, Shadow, Mech, Poison)
Crystal Cave (Plasma, Mech, Crystal, Poison)
Poison Lab (Shadow, Mech, Crystal, Poison)
Ethereal Arcanity (Plasma, Shadow, Mech, Crystal, Poison)
The Ethereals for their respective islands will transpose over there, and they can be bred, regardless of stability.
This is just the part 1, more info on the islands will come later.