Looking for colossal worm

[Kadarai]

Hello, I've been busting my head to remember where I saw this but can't,so I hope on of you guys may remember.

I'm looking for a monster from a dragon\dungeon magazine. It is a colossal, castlesized wormlike thing big enough that it is said to be a plain in itself or extension of a plain. If cut it regrows. I remember a pic of it coiling around a castle.

Anyone ever came across it?

[BWR]

One of the layers of the Abyss was a draeden (https://en.wikipedia.org/wiki/Draeden). Could that be what you were thinking of?

[ShurikVch]

Ugudenk, the Squirming King (Dragon #359) - ruler of 177th layer of Abyss

https://t11.deviantart.net/3BrEBsZThM87qIAjuCwhtCSHTo8=/fit-in/700x350/filters:fixed_height(100,100):origin()/pre00/122b/th/pre/f/2007/251/2/1/ugudenk_by_njoo.jpg

[Remuko]

Ugudenk, the Squirming King (Dragon #359) - ruler of 177th layer of Abyss

http://i284.photobucket.com/albums/ll39/ShurikV4/ugudenk_by_njoo_zpsuwrwyqgw.jpg?t=1504569300

people cant see photobucket links anymore btw.