a sogbone skeleton  

Thanks to "Listlurker" for this description of where to find Sogbone Skeletons.

In Antonica, go to the bridge leading to the South Qeynos gate (it's the closest to the Griffon Tower).

Enter the water west of the bridge. It's probably a good idea to get a friendly cleric to cast a water-breathing spell on you before you go. The skeletons are underwater, and you don't want to have to worry about drowning on top of everything else.

Swim near the bottom, west and slightly northish. When you get near the following coordinates: 531.42, -49.85, 375.82 (type the command /loc in your chat space, and then hit Enter, to compare your character's current location against these coordinates).

NOOBS AND LOWBIES BEWARE! When I was there last, there were at least two groups of three sogbone skeletons (level 14-15)each, all milling about very close together on the bottom. If you're not careful, you could end up dying a watery death.

Good luck!