Encountered in the cave with the trolls and the orrery the party needed to take.
Given the party's golden egg by Vathos. Upon seeing Narl, the Beholder screamed "Heartrender!" and fled.
Party received an image of this Beholder opening the golden egg and becoming something more.
There is now an altar with the Beholder's image flickering in and out on it, in the Sanctum of Duality.

Encountered inside the body of the Rephaim of Death, attempting to steal the golden egg from the party.
Sold a golden egg by Barabor, in the marketplace of Ei'Thalar.
Party received an image of this Red Hag opening the golden egg and becoming something more.
There is now an altar with the Red Hag's image flickering in and out on it, in the Sanctum of Duality.

First encountered dying over and over again, pierced by a spear, in the shared prophetic dream of the party.
Then encountered in the Cathedral of Convergence. Led the group through the crumbling Cathedral, into the body/ demi-plane of the dead Rephaim of Death. Disappeared when the party portaled out of the god/ demi-plane and into Rarenth.
Vathos and Dickens have further information.

Empress of Meohmair. Acquired the throne under mysterious circumstances; her brother was Heir-Apparent.
Youngest Empress in history.
Patron of the party.

Former Fae, princess of the Feywild. Bitten by a Vampire. Re-calibrated in the Sanctum of Duality.
Emerged taller, more serene, with marble-like skin. 

Creature that brought the characters into the prophetic dream, and kicked them out.

Sentient gargantuan tree, responsible for the upkeep of Meohmair's motes.
Dickens has further information.

Artifact. Emerged from the Amalgamatum.
Currently attached to Narl.

First Emprex of Meohmair.
Encountered as an ArchLich in Nekhmet (it was later discovered).
Believed to be a Patron of Vathos.

Auto shouted out "I AM WAS!" just prior to the light beams shooting out of/ into each of the party members in the ArchDruid's chambers. This same statement is etched around Auto's head 4x.

Ruby Dragon previously trapped in the Ruby Dagger of the same name. Released via Remove Curse in a ritual performed by Vathos and Owl.
No other party members are aware of Gaetsys. (?)

There is no such thing as Orc gods, or any gods besides the Qodam and the Xovos, on Meohmair.
Still, there are four altars to Orc gods in the Sanctum of Duality: Uthri, the Master Artificer; Valaria, the Muse of Beauty; Zalreth, the Shadowweaver; and Dromak, the Divine Innovator.

Owl's Crystal Dragon mentor.

Realm found through the portal in the ArchDruid's sanctum.
Owl discovered 'The Lost Rites of the Qodam' here.
Sanctum of Duality is located here.