Ment
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Alex, after consulting with a group of experts at two conferences, we came to the conclusion that magic is completely unusable. With the number of available skill points and the exorbitant requirements for spells, it's practically impossible to create a viable magic user, and in any case, you'll have to resort to min-maxing. Mana costs of 300 with an 85% chance of failure are not funny at all. When you need to spend half of all your skill points just to build up a mana pool to have a minimal chance of casting this spell once (with a 50% chance of failure), and spend the other half of your points on buying this spell and a couple of other equally useless ones – that's not cool. In your system, a mage is doomed to rely on a couple of weak spells, investing the rest in a hybrid build, or trying to cast one powerful spell twice before some village bumpkin walks up, picks his nose, and hits him on the head with a club.
Personally, I didn't look at how fighters, rogues, or archers fare, but in terms of spells, you either need to significantly buff magic or increase the number of available skill points. This isn't just my opinion.
Well, I think you planned that once people start experimenting, you can adjust the balance, so it's not a big deal.
By the way, I was just going to write that because of this
Intelligence
Intelligence determines the turn order of a character