Xernaia

Xernaia, the Grim Omen, is an unusual Dragon who appears to be a mix of a Metalic and Chromatic Dragon Greatwyrm, with a few hints of Gem Dragon and a scorpion-like stinger on the tip of her tail, but she has no relation between either of the three types of dragons. Many scholars across the multiverse believe that Xernaia isn’t an actual true dragon, but a fiend who can regenerate wounds like a troll, and has the power to enslave or dominate elementals and undead creatures to her malicious will. While others think she was once a dragon god of another name, who tried to claim Asgorath’s power as her own and suffered from it by her own hubris, but some say she was betrayed by one of her yonger siblings within the Draconic Pantheon, before cast into the void until being found and freed from her imprisonment by the Tenebris Crusade. Now in the present, still redused of the status she once had, Xernaia now tries to achive goals, some of which aren't well known across the multiverse except for her and her followers. Experimenting on some of her loyal followers, while creating new spells or breeds of dragons, and forming fragile alliances with various factions across realities, such as the Githyanki, Githzerai, and a species of Gith living in the world of Unithéra.

Relations with the Draconians and her followers.
Some scholars believe that Xernaia was the first to succesfully create the first Draconians, also known as Dragonkin or Draconids on other worlds except for Krynn, mostly due to them being part of her followers and that she often taking the form of a large draconic male humanoid with cat-like eyes, greyish-purple skin and dark grey hair, when ever conversing with her followers.

Most that follow Xernaia are draconic creatures of either True, Lesser, or related to the Dragons by blood. Most of the True Dragons, such as the Metallic, Chromatic, Gem, Ferrous, or Oriental Dragons chose to follow her due to her true heritage or by dissolution of the gods they once served, while Lesser Dragons and blood related creatures follow her out the feeling of protection and comfort that Xernaia offers. One of these followers, Íthkorak the Eternal Guardian, is one Xernaia’s seacond in command and the only consort she has, claimed to be one of the first Dracolich with the same abilities as a regular lich, and the guardian her true lair in Limbo while she’s away in one of her many lesser lairs on the material plane.

Relations with the Queen of Dragons.
There have been sightings of skirmishes between Xernaia's followers and the followers of Tiamat, most often leading to either a stalemate or annialation on one of them. No one is clearly sure as to why such fights happens, but some, such as the followers of Bahamut, are glad to know such fights are occuring, and hopes that it will weaken or thwart any plan Tiamat or her followers have.

Xernaia’s Lair

Xernaia’s lairs are often temporary when she arrives in the material plane and can be in high mountains, hills, near costal regions, or within the deep halls of abandoned mines and humanoid strongholds. Caves that are near areas that have suffered mass death are the most highly prized by Xernaia, letting her create a temporary lair and allowing her to summon undead monsters, if her followers haven't gathered to her location, making them her first line of defence to hinder, stall, or kill any intruders from reaching their mistress and her hoard that is made out of scrolls, books, and parchment.

Once her hoard well protected deep within the lair, Xernaia spends as much of her time outside the lair as in it. For her, studying the actions caused by either her draconic kin or the mortals that live in the world is the way to gain the knowledge and power for her one of her goals, which is to restore the lost draconic heritage and bring her wrath towards any  creature who has harmed the dragons in the past.

Throughout the lair complex, undead servants erect monuments to Xernaia's power at the behest of her followers, telling the grim story of her life, the enemies she has slain across the multiverse, and the world she has annihilated during her time serving the Tenebris Crusade.

Lair Actions

On initiative count 20 (losing initiative ties), Xernaia takes a lair action to cause one of the following effects; Xernaia can’t use the same effect two rounds in a row:

• Magma erupts from a point on the ground the dragon can see within 120 feet of it, creating a 20-foot-high, 5-foot-radius geyser. Each creature in the geyser’s area must make a DC 15 Dexterity saving throw, taking 21 (6d6) fire damage on a failed save, or half as much damage on a successful one.
• A tremor shakes the lair in a 60-foot radius around Xernaia. Each creature other than Xernaia on the ground in that area must succeed on a DC 15 Dexterity saving throw or be knocked prone.
• Toxic gases form a cloud in a 20-foot-radius sphere centered on a point the dragon can see within 120 feet of it. The sphere spreads around corners, and its area is lightly obscured. It lasts until initiative count 20 on the next round. Each creature that starts its turn in the cloud must succeed on a DC 13 Constitution saving throw or be poisoned until the end of its turn. While poisoned in this way, a creature is incapacitated.

Regional Effects

The region containing Xernaia’s lair is warped by a mixture of draconic, elemental, and necromantic magic, which creates one or more of the following effects:

• Minor undead incursions are common within 6 miles of Xernaia’s lair.
• Malformed experiments, Draconians, Dragonborn cultists, Half-Dragons, and lesser dragons will lurk within 1 mile of her lair.
• Rocky fissures within 1 mile of Xernaia’s lair form portals to the Elemental Plane of Earth, Air, Fire, and Water, the Nine Hells, and the Abyss, allowing creatures that reside in those planes easy access into the world to dwell nearby.

If Xernaia is defeated or leaves, these effects fade over the course of 1d10 days.