I did the slavers at 12th level. I wasn't familiar with any of the post temple content, so I just tried to pick up any quests I came across. Once Oodenard had told me where the slavers were, I went and killed them, then the WOTGS came up next. WOTGS also seems to introduce two fairly significant CTDs to the game. The first is one levelling up, if you try and increase spot or tumble too quickly it causes a CTD. The other is about 50% of transitions cause a CTD. This was particularly painful when I just did the Deitieds and Demigods fight then forgot to save before transitioning. Needless to say it crashed!