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Horned Lizard Head With 4 Chin-Tentacles
Alignment Lawful Evil
Divine Rank Unclear
Pantheon Mystaran (Cynidicean), Elder Evils
Portfolio Corruption, Decadence, Degeneration, Destruction
Domains Destruction, Evil, Law
Home Plane Prime Material Plane (Mystara)
Worshippers Cynidiceans
Favoured Weapon Light Flail

The Returner, as he appears in Elder Evils.

Zargon is a terrible monster that lies within the Lost City of Cynidicea on Mystara. Awoken from its slumber in a deep chamber beneath the earth, nobody actually knows what the fuck this thing is; it might be the creation of some deranged wizard, or maybe the servitor of some Immortal of Entropy now lost to time, or even a physical shard of some greater being. Most sources, however, state him to be the leader of the Original Baatorans and the guy who ruled Baator before Asmodeus kicked him out.

Whatever its origin, Zargon is a brutish and savage creature; nearly 35 feet tall, it resembles a cyclopean lizardfolk with a single mighty horn on its brow, with each limb replaced by a cluster of three writhing tentacles tipped with razor sharp talons. It oozes a noxious gray slime, which lubricates its way as it slithers and crawls itself along. Contact with this slime can turn people into ooze monsters called Whelps of Zargon. It is virtually impossible to kill, save by slaying it and then casting its horn - the source of its immortality - into a pool of lava before it regenerates a new body 24 hours after its death.

At the height of their culture, the ancient Cynidiceans awoke Zargon as they delved into the depths to construct their great underground city. Zargon responded by rampaging through their streets, killing many, until they learned to tame its hunger with human sacrifices. A cult sprang up around the foul creature, and over time it drew the people of Cynidicea into drug-addled deliriums, creating a culture of eternal debauched revelry that saw the empire crumble and reduced the Cynidiceans to the twisted, maddened things they are now. In time, it's likely they will all perish, leaving Zargon alone in the ruins of their city.

This version of Zargon made his first appearance in the module B4: The Lost City for BECMI. It was later updated to Dungeons & Dragons 3rd Edition in Dragon Magazine #315. In this same edition, Zargon would be reinvented in the sourcebook Elder Evils, which claims that Zargon is actually an elder fiend, a former king of Baator cast out the Nine Hells by Asmodeus. Zargon would also be mentioned as a possible native of the Nentir Vale setting in the Dungeon Survival Handbook splatbook for Dungeons & Dragons 4th Edition. His most recent mention was in the 5th edition player's handbook, where he's a suggested patron for Great Old One Warlocks, although given the above he should also work as a fiendish patron.

The Immortals of Mystara
Sphere of Thought
Ahmanni Turtlerider - Arnelee - Asterius - Cretia - Diulanna - Frey - Freyja
Halav - Harrow - Karaash - Korotiku - Koryis - Noumena - Odin - Palson
Raven - Saimpt Clébard - Saimpt Loup - Saimpt Malinois - Saimpt Mâtin
Saimpt Ralon - Sinbad - Ssu-Ma - Tiresias - Tourlain - Turmis - Tyche
Sphere of Matter Sphere of Time Sphere of Energy
Atruaghin - Chiron - Crakkak - Diamond - Djaea - The Eternal General
Faunus - Forsetta - The Great One - Garal Glitterlode - Gorrziok
Hattani Stoneclaw - Ka the Preserver - Kagyar - Lokena
Maat - Malafor - Opal - Paarkum - Pearl - Polunius - Terra
The Twelve Watchers - Valerias - Wayland - Wogar
Al-Kalim - Calitha Starbrow - Carnelian - Chardastes
Finidel - Kallala - Khoronus - Liena - Ordana - Petra
Protius - Sharpcrest - Taroyas - Vanya - Verthandi - Yav
Alphatia - Bartziluth - Bemarris - Benekander - Eiryndul
Gorm - Iliric - Ilsundal - Ixion - Kythria - Lornasen - Madarua
Mahmatti Running Elk - Marwdyn - Mealiden Starwatcher
Minroth - Palartarkan - Patura - Pflarr - Rad - Rafiel
Rathanos - Razud - The Shaper - The Shining One - Slizzark
Tahkati Stormtamer - Tarastia - Thor - Usamigaras - Zirchev
Sphere of Entrophy
Alphaks - Arik - Atzanteotl - Bagni Gullymaw - Brissard
Danel Tigerstripes - Demogorgon - Hel - Jammudaru - Leptar
Loki - Masauwu - Nyx - Orcus - Ranivorus - Saasskas - Talitha
Thanatos - Yagrai