I would suggest to first start some ground combat (and if you wish dragon combat too) in Stone's and Raze's Flying Fortress .

I creared the Ministry (helping Zandalor) at level 28 and to my great suprize it was never so fast done as before, never so easy with my Priest build using Creature (fighter L9) and Summon Demon L6 and Summon Mastery L3 (+ 2 from Laiken's Sword) ... even on nightmare !

If you like trading ? ...
... go for the Ministry battle and after that, Mindread Deodatus and you've just another trader ! wink

On 7th of february 2015 : I start a new adventure in the Divinity world of Original Sin,
it's a Fantastic Freaking Fabulous Funny ... it's my All Time Favorite One !