By establishing himself as a deity of frost giants, Kostchtchie directly encroached upon the domain of Thrym, though that titan did not take direct action against the demon lord. The dwarven deity Clangeddin Silverbeard considered Kostchtchie, as well as the other evil giant deities, a hated enemy.
Kostchtchie was born as a mortal man, but one who was severely deformed. Spurned by tribes and by women, he was driven to anger and rage. He turned to brutal murder, slaying every woman who ever mocked him and crushing the skull of his former tribe's chieftain with his bare hands.
In time, he was found and mentored by the great witch Baba Yaga. She gave him a set of cursed, nested skulls. Inside the innermost skull—that of a tiny quasit—was hid a black diamond, and Kostchtchie used dark magic to transfer his soul into this gem, granting himself immortality.
Now unable to be killed, Kostchtchie's body grew both larger and more hideous, until he was the size of a great giant. His tribe grew to the size of a kingdom, and their murderous exploits became infamous and were noticed by powers from other planes of existence. The celestial paragon Gwynharwyf led an army of against his forces, but she was not able to overcome him until she discovered the demonic source of his power. She found and destroyed the skull and its gem, returning his soul to his body so that she could slay him, sending his hateful soul to the Abyss.
However, this was only a minor setback for Kostchtchie, whose body was recreated in the Abyss in demonic form.
Around the Year of the Stone Giant, −160 DR, Kostchtchie's hortha was summoned by summoners of Narfell. Frost giants gathered under this hortha and fought on Narfell's side. It wasn't clear what exactly a hortha was, but given that urhortha meant avatar, chances were that hortha meant an aspect of the demon lord.[speculation]
Sometime prior to the Year of Three Ships Sailing, 1492 DR, Kostchtchie was defeated in combat by the archdevil Zariel, who stole his hammer, the mighty Matalotok, and imprisoned him in a ravine in Avernus.
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- ↑ The class is given for Kostchtchie's avatar.
- ↑ 1.0 1.1 1.2 Ed Stark, James Jacobs, Erik Mona (June 13, 2006). Fiendish Codex I: Hordes of the Abyss. (Wizards of the Coast), pp. 68–69. ISBN 0-7869-3919-2.
- ↑ 2.0 2.1 2.2 Mike Mearls, Brian R. James, Steve Townshend (July 2010). Demonomicon. Edited by Scott Fitzgerald Gray. (Wizards of the Coast), pp. 122–123. ISBN 978-0786954926.
- ↑ 3.0 3.1 Colin McComb (1996). On Hallowed Ground. Edited by Ray Vallese. (TSR, Inc), pp. 175–176. ISBN 0-7869-0430-5.
- ↑ 4.0 4.1 4.2 4.3 4.4 James Jacobs (July 2006). “The Demonomicon of Iggwilv: Kostchtchie: Prince of Wrath”. In Erik Mona ed. Dragon #345 (Paizo Publishing, LLC), pp. 21–22.
- ↑ Carl Sargent (May 1992). Monster Mythology. (TSR, Inc), p. 82. ISBN 1-5607-6362-0.
- ↑ Frank Mentzer (January 1985). “Ay pronunseeAYshun gyd”. In Kim Mohan ed. Dragon #93 (TSR, Inc.), p. 28.
- ↑ Adam Lee, Christopher Perkins (September 17, 2019). Baldur's Gate: Descent into Avernus. (Wizards of the Coast), p. 4. ISBN 0786966769.
- ↑ Ed Stark, James Jacobs, Erik Mona (June 13, 2006). Fiendish Codex I: Hordes of the Abyss. (Wizards of the Coast), pp. 135–136. ISBN 0-7869-3919-2.
- ↑ Bruce R. Cordell, Ed Greenwood, Chris Sims (August 2008). Forgotten Realms Campaign Guide. (Wizards of the Coast), p. 67. ISBN 978-0-7869-4924-3.
- ↑ Carl Sargent (May 1992). Monster Mythology. (TSR, Inc), p. 74. ISBN 1-5607-6362-0.
- ↑ Eric L. Boyd (1998). Demihuman Deities. (Wizards of the Coast), p. 58. ISBN 0-7869-1239-1.
- ↑ Brian R. James and Ed Greenwood (September, 2007). The Grand History of the Realms. (Wizards of the Coast), p. 55. ISBN 978-0-7869-4731-7.
- ↑ Adam Lee, Christopher Perkins (September 17, 2019). Baldur's Gate: Descent into Avernus. (Wizards of the Coast), p. 104. ISBN 0786966769.