I take the most strongest potion of each I have, for example a potion of Ultimate Strength, Dexerity, Intelligence, Full Resistance ... !
So my stats are on this way very high for 180 seconds and in that time I kill all enemies!
With Firewall 4/10 most of the enemies die fast... and Magic Blast is already great with 6/10.

I used for the whole final battle 5 or 6 greatest Healing potions.
On the moment too much enemies surrounded me I use Firewall and run away! Great!

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 !