Would Zorquan (Ancient Dragon god of dragonness, concerned only with the survival of dragons as a species) be a Unity domain patron deity of the draconic pantheon, as far as Cleric domains go?
It seems Lord Zorquan is attested in only two official canonical books ever: the 2e Forgotten Realms sourcebooks Draconomicon page 28, & Cult of the Dragon page 121 (also, name invoked by Malygris in writings on pages 63 & 119). No avatar or other stats are given, only a description in each book, as follows:
(High One, Greatest Wyrm)
Deity of Dragonkind, Greater Power of the Prime Material Plane, Neutral alignment
Symbol: A black circle superimposed on a larger, concentric white circle
Although Zorquan is often described as the deity of dragonkind, he is really the deity of dragonness. As Corellon Larethian represents the central ideals of elvenkind, so does Zorquan represent the central ideals of dragonkind. He represents power, pride (which all dragons, even golds, have in abundance) and, most importantly, status. Although he is generally classed as neutral, Zorquan’s alignment would more properly be described as 'any'.
Zorquan is totally unconcerned with creatures other than dragons, except when their behavior affects dragonkind. He is the implacable enemy of any who would harm dragonkind (not, you will note, individual dragons). Adventurers who slay the occasional black or blue dragon will never feel Zorquan’s wrath. Members of all dragon species worship Zorquan.
He can manifest himself as a perfectly-formed version of any species of dragon. Whatever his form, his eyes crackle with sparks, sometimes spitting lightning bolts that flash and crack around his body. Zorquan is said to live somewhere on the Prime Material plane. Many legends tell of dragons with the temerity to visit his halls, but none give details on how to get there.
Later, a section detailing the draconic Holy Wars reads, in part:
~ Warfare tore through the ranks of dragon- kind, and at one time was violent enough to significantly deplete the Tori1 dragon population and actually threaten extinction unless something changed. Maybe it was the subtle influence of Zorquan, or maybe it was just that self-preservation finally came to outweigh the drives of fanaticism. Whatever the case, the dragons eventually turned away from the war, realizing that to follow their present course would lead to certain death for every dragon on the planet. ~
(High One, Greatest Wyrm)
Zorquan is a neutral intermediate power of the Outlands. His portfolio is dragonkind and dragonness (the essence of that which is dragons), and his symbol is a black circle superimposed on a larger concentric white circle.
(Cult of the Dragon pg121)
As far as I have been able to determine, this is the entirety of canonical material provided on Zorquan!
I did find one webpage detailing a homebrewed stat-block & church for Zorquan, complete with an extensive subclass description for his Exemplars, at: blog.aulddragon.com/2015/04/zorquan-the-high-one
I find the homebrew content from AuldDragon quite acceptable, though I don't plan on roleplaying it directly, since it is homebrew & we're playing a fairly by-the-book 5e campaign.
Given the information available, does it make sense that Cleric characters with Zorquan as their Patron would most aptly be classed under the Unity domain?
If there is another more appropriate domain, or if I'm doing this entirely wrong, please inform me!