Hello,
I've just created this account to share few thoughts about my personal mage build.
First off, let me state that I didn't finish the game yet - I'm finishing now side quests at Orobas Fjords.
My build for the moment:
80% points in intelligence
15% into vitality
5% into spirit
why?
You don't need high mana pool. I have like 350 mana at 26lvl and it's more than enough. Yes, you'll be burning many pots but with Battle Tower making or buying them is not the problem. You can say, it'd be difficult at the beginning - money problems - but I had none. Didn't make a lot of money, but it'd be enough to buy few upgrades right away when you finally got your precious Tower.
I focused on intelligence, I wanted my dps to be the highest possible - but with enough survivability - that's why I put some points into vitality.
Skills (at the moment):
Magic missile: 9 (my main skill)
Fire ball: 5
Fire wall: 2
Lockpick: 5
Healing: 5
Destruction: 4
Mana Effeciency: 4
Summon Demon: 4
Way of the Battle Mage: 1
Mind reading: 1
Magic Blast: 1
My thoughts:
Either Fire Wall is OP or it has a glitch: cast it not on the mobs, but try luring them into the circle - they'll die instantly. It works the same if you try luring them out, but it's more safe to do otherwise. Pretty much I use Fireball as an opening, followed with Magic Missile spam. Demon works great as a tank. I do use healing - and sometime both healing and potions. Pretty much later in the game it's really hard to do something that would make the game hard as a mage.
I have yet to respec, dunno how yet, because I'm thinking about putting few points into dexternity and getting low-req, high magic damage bow, because it might be really fun to play.