Mr.Satan said:Ello![]()
A nebula can get to be as big as a tiny dwarf galaxy. A dwarf galaxy can get to be as small as a nebula. The Tarantula Nebula is 1000 light years across, a dwarf galaxy can be smaller or larger depending on which one it is. A galaxy can be hundreds of thousands of light years across by comparison.
I'd say that an elder one could easily be the embodiment of a dwarf galaxy if it's on the small end (500 light years or so) of the spectrum if I were to go by what you're saying about size ratios. Dwarf galaxies can conceivably exist within normal galaxies, as can nebula.
There are also many superclusters within our universe, so I'm even wondering if a first one should be a supercluster and not the universe itself since the multiverse is the demi-urge. I'm beginning to wonder if it should go something more like this...
Multiverse: Demi-urge
Universe/Dimension: First One
Supercluster/Plane: Old One
Galaxy/Planar Layer: Elder One
As it is, you have it more like this...
Multiverse: Demi-urge
Universe/Dimension: First One
Galaxy, Supercluster/Plane: Old One
Celestial Body, Nebula/Planar Layer: Elder One
Which might make sense. But would still allow for dwarf galaxies on the smaller end of the spectrum.
It's purely for roleplaying purposes.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.