I used Charm (5/5) to turn the tide of this battle laugh !! And my Creature had all four bodyparts of Perfect Ghoulish quality (L10 Rush Attack & Fatality!) and my Summon Ghosty Ghost (12/13) help me healing and attack enemies with Fireballs ... After 2 minions Charmed it was not so difficult to focus on Ba'al from afar using Stun Arrow and then Explosive Arrows ... the battle was over before I really realized biggrin
(but to say : I was already level 33 )

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 !