Eru is 5-D and The Ainur has a higher dimension rating.
This is something I've always said.
That; within the Eternal Hall, observers would see reality (3-Dimensional Space Continuum), only limited to Drama. This context here refers to-Reality>Fiction Gap.
However, the general question is, why is it declared a Reality Fiction Gap? Even though it could be that the Eternal Hall is outside our physical Universe, or in a different Dimension (same 3-Dimension but has a different place structure, analogically we can compare it like Universe-1 is an Infinite sized 3-D Space-time Continuum, and Universe-2 are Infinite Sized 3-D Space-time Continuum too, the difference is that in Universe-2 they don't have a Universe instead the word "Universe" is just a Label, but these two things are still reduced as L-2C because they are the same size). In fact, the Immortal Hall also stated:
• Outside the Universe (1)
• Separated from the Void (2)
These two things allow us to state that these dimensions are equivalent (lowball).
However, by stating that Ainur Sees Reality as Drama, this increases the Quality of Achievement which is coherent with the Higher-Dimension (Eternal Hall). Then this will qualify as "Ontological Superiority"
All Ainur members are very clean to get a Higher-Dimension rating, and have their own Physical Body in the 3-Dimensional World and walk according to the 3-Dimensional axis.
Iluvatar? Why is it 5-Dimensional?
Letter 192 has proven that Iluvatar already has an existence equal to the authority of The Lord of The Ring's Verse, even surpassing the Existence of A.K.A J.R.R Tolkien's Authority, so it is not impossible for him, to be reduced as a 6-Dimensional entity.
If you are still confused in the section on my explanation of Iluvatar Existence, later I will send a link to the VsB Thread where I state that Iluvatar has a 5-Dimensional Existence and has so much more potential.