First I think psychic attack needs fixed. You shouldn't be able to spam it constantly so the other person can't do anything because they have no mana at all. (you can't even disarm them because that takes mana also). Maybe put in a small delay on using it like some other skills, spells, and potions.
I also think a cool idea for ds (death strike) would be to have it do more damage based on how far you run after you are hit with it.
I'm sure there are other spells that would be nice to have adjusted so they are usable. (we have way more hp, mana and stam then the spell levels where designed for.