There is a very common misconception in the community regarding Tiamat's stat blocks in Rise of Tiamat and Baldur's Gate: Descent into Avernus. Many players and DMs claim that these are merely stat blocks for her "avatar," because statting her true form would be impossible.
However, looking at the lore and the text, these absolutely represent her true form.
First, let's look at the premise of Rise of Tiamat. The entire module is built on the Cult of the Dragon trying to free Tiamat from her prison in the Nine Hells. If the ritual only summons an avatar out of Avernus, the logic of the entire campaign falls apart.
Rise of Tiamat, p7:
The time of dragons dawns. Calling upon ancient magic and a host of draconic allies, the Cult of the Dragon seeks to unleash Tiamat from her prison in the Nine Hells.
Furthermore, the good ending of the module isn't about thwarting her avatar's plans in Faerûn; it's about defeating her true form so severely that she discorporates and is banished back to her prison.
Rise of Tiamat, p174:
If the characters reduce Tiamat to 0 hit points, her Discorporation trait kicks in. The portal collapses as the shrieking Dragon Queen disintegrates and is dragged back to Avernus. She will remain trapped there until someone else can recreate the conditions of the ritual and try again to free her.
Whenever this is brought up, people usually push back with three main arguments. I want to address and debunk each of them.
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Argument 1: "Tiamat was unkillable by players in older editions, so she shouldn't have a 5e stat block."
False. Outside of 2e, players have historically been able to fight and kill her.
- 1e: In The Throne of Bloodstone, players literally need blood from the heart of Tiamat to destroy the Wand of Orcus. Bahamut sends the party to the Nine Hells to kill her.
- 2e: This is the only exception, mainly because Faiths & Avatars (p. 14) established a rule that mortals could usually only destroy demigods, and Tiamat was a lesser deity at the time.
- 3e: She had at least two official stat blocks. One in Deities and Demigods (p. 93) with a Divine Rank of 10, and another in Manual of the Planes (p. 118) with a CR of 25.
- 4e: Draconomicon: Chromatic Dragons (p. 246) explicitly provided three permanent ways to kill her:
DESTROYING TIAMAT
Only by meeting specific conditions can the characters hope to kill Tiamat. The following are sample quests.
Appeal to Avarice: An ancient treasure was lost in the Astral Sea while being transported in a githyanki ship. If the PCs can locate this cache of immaculate gems and rare metals, they can use Tiamat's greed to draw her out of her domain. They must trick her into entering a domain under the control of Bahamut, where she can be slain, or at least her discorporated essence can be trapped.
Draconic Weapons: The PCs must kill five ancient dragons, each of a different chromatic variety, then craft magic items from their bones or scales. Only if they are wearing or using these items can they destroy Tiamat. At least one of the ancient dragons killed for this purpose must be a past or present consort of Tiamat.
Gather Tiamat's Eggs: One hoary old tome printed on basalt pages and bound in purple dragon scales describes a ritual called Fashioning Tiamat's True Death. This ritual's intricate recipe includes procuring at least one of Tiamat's eggs, in which a newly forged weapon must be quenched. Multiple weapons require multiple eggs. If the weapon is used against Tiamat and draws blood at least once, the god's essence is destroyed, not discorporated.
Since 5e caps its power scaling at CR 30, assigning her true form a CR 30 stat block is entirely consistent with D&D history.
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Argument 2: "Tiamat is a Greater Deity on par with Mystra, so statting her is ridiculous."
False. Tiamat is not, and has almost never been, a Greater Deity. She is canonically a Lesser Deity across multiple editions:
- 2e: Cult of the Dragon, p.121
- 3e: Draconomicon: The Book of Dragons, p.35
- 4e: Forgotten Realms Campaign Guide, p.62 (Note: 3e's lesser deity equals 4e's god, per FRPG p.153).
- 5e: Monster Manual (2014), p.86
Some might argue, "But Takhisis from Dragonlance is Tiamat, and Takhisis is a Greater Deity!"
Even if we accept Takhisis as an aspect of Tiamat, the Tiamat trapped in Avernus is definitively a lesser god. The 2014 Monster Manual (p. 86) explicitly states: "Tiamat the Dragon Queen is the chief deity of evil dragonkind. She dwells on Avernus, the first layer of the Nine Hells. As a lesser god, Tiamat has the power to grant spells to her worshipers, though she is loath to share her power."
If we ignore Divine Ranks and just look at the lore, her power level has never been Mystra-tier. Historically, she is treated as a servant or a watchdog.
4e Forgotten Realms Campaign Guide, p62:
In these outlands, Bane's servant Tiamat lurks and plots in the various lairs that Bane allowed her to build.
Fire in the Blood, p520:
Tiamat. The Dragon Queen. Guardian of the Gate to the Second Layer. Latest Vassal of Asmodeus.
Manual of the Planes 1e, p109:
The watchdog of the Hells' front parlor is Tiamat.
Planes of Law, Baator, p16:
Tiamat, the Lady of Dragonkind, guards the only known stable entrance to the next layer. It's only through her lair that one can arrive in the verdigrised plains near the Iron City of Dis.
In 5e's Baldur's Gate: Descent Into Avernus (p. 148), it's explicitly noted that: "Challenging an archdevil directly is risky, and Tiamat stands to lose a great deal if Zariel prevails."
Considering that she cannot even guarantee a win against Zariel and was famously killed by Gilgeam (an Intermediate Deity) during the Time of Troubles, putting her on par with Mystra makes no sense. Power-wise, she is much closer to Auril or Bahamut.
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Argument 3: "Dragons are incredibly powerful, so the Dragon God must be exponentially more powerful."
Dragons are physically and magically powerful, yes. But in the Forgotten Realms, divine power is directly fueled by worship.
Dragons are notoriously arrogant, independent, and narcissistic. The vast majority of them do not actively worship gods. Because her primary demographic (dragons) rarely gives her true devotion, Tiamat lacks the massive reservoir of faith that human or elven deities enjoy.
Compare them to Giants: Giants are generally highly devout toward the Ordning and their creator gods. As a result, the Giant Pantheon is significantly stronger and more cohesive than the Draconic one.