Ubothar is a festering Obyrith lord imprisoned off the Abyss.
Sources:
"The Thunder Below" (free adventure from wizards.com)
Fiendish Codex I
Dragon #349
- 1045 reads
Planescape, Dungeons & Dragons, their logos, Wizards of the Coast, and the Wizards of the Coast logo are ©2008, Wizards of the Coast, a subsidiary of Hasbro Inc. and used with permission.