Demogorgon appears as an 18-foot-tall (5.5 m), reptilian (or amphibious) hermaphroditic tanar’ri with a somewhat humanoid form. Two mandrill heads sprout from his twin snake-like necks, and his arms end in long tentacles.
Demogorgon is a powerful demon. He is known as the Prince of Demons. Demogorgon is also known as Lord of All That Swims in Darkness.
Some Recent Accomplishments:
- Shattered the Living Gate Giving rise to the ShardMinds and opening portals across the planes
- Captured Tiamat and Bahmut for reasons unknown
- Affiliated minions are helping the Court of Winter in the Battle against summer
From The Library in Senaliesse
Demons and Demigods:
It is contended by some that this demon prince is supreme, and in any event he is awesome in his power. This gigantic demon is 18’ tall and reptilian. Demogorgon has two heads which bear the visages of evil baboons or perhaps mandrills with the hideous coloration of the latter named beasts. His blue-green skin is plated with snake-like scales, his body and legs are those of a giant lizard, his twin necks resemble snakes, and his thick tail is forked. Rather than having arms, he has great tentacles. His appearance testifies to his command of cold-blooded things such as serpents, reptiles, and octopi.
History of Ixixachitl:
Why he chose the ixixachitl to become his worshipers, and why that race of sentient rays has chosen to follow him, is very hard to determine. Demogorgon may wish to use the ixixachitl to further the ambitions of the tanar’ri in the Blood War, although how they could help him is not clear. What is known is that Demogorgon has a hatred of Sekolah the sahuagin god; some myths portray the tanar’ri as a one-time vassal of Sekolah, magically compelled to service through an artifact. Demogorgon does not direct ixixachitl attacks specifically at sahuagin, but he is pleased if his servants happen to find themselves in a position where sahuagin are the logical next target for their massed attacks.
From the ixixachitl’s point of view, they may be gaining power from their association with Demogorgon-as is the tanar’ri lord himself. Through some strange warp in the Abyss, it may be that the actions of vampiric ixixachitl in energy draining victims (in sacrifices in many instances) somehow transfer magical energy to Demogorgon and strengthen him. This twist in the planar fabric may somehow amplify and transform this energy, and some of it appears to create a backlash on the ixixachitl, who have become more powerful spellcasters than they once were. The fact that vampiric ixixachitl alone can become the most powerful priests seems to support this hypothesis.