That dragon is found on water map between planar dwarf area outside and water area, it is underwater.
Nemesis was the 3rd winner of that phase of the quest/event. Steel and Tribly both won in that order the 3rd phase, but they had already won two of the previous events so the event was continued and on the 3rd try, we both moved away from the final kill at half health.
Steel - me - won beholder belt, dire gloves, adamantite boots. - Leveled to 40 off all the dragons and snake guys.
Trilby - not sure I crashed >

Nemesis won the 4 +4 books.
There was some wierdness with the water plane snake guys, thier models it appears are allowed to stack all on one spot. So thier collition model appears very small, which killed a lot of people thinking they had one or 2 on them, but really had 20.

But we were back up and running pretty fast.
It was great fun, I did crash 9 times, but that always happens with my Linux client when heavy spells are going of and I'm rotating the screen to pick the target, with 8 dragons moving around its hard to target one in the back. Happens on windows also to other folks as well.
Thanks for the fun.
Steel/Umpa