Mage Build For Reincarnation?

I have begun preparing for the Reincarnation quest and I was wondering what build I should have. My current best weapon is the Ethereal. So what should I invest my skill points too when i reset them and how much hp should I have when I take on Bob?

 

You need high neutral damage if you're planning on even poking him. Without it, don't think about soloing it. .-.

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Or you could just get a bunch of friends and starting punching bob around.

 

Sadly Bob has full elemental defense so you need neutral damage, I used Bianco, in order to damage him. Also as a mage you don't output enough dps to kill him. It took me 4 attempts but eventually my friends and I beat him. The way we killed him was with three mages and an assassin.