pawsplay
Hero
if you have no racial bonuses to any mental ability score, then it's impossible to raise that stat above 18, and therefore impossible to cast 9th level spells without some sort of special help- bringing up the separate problem that dwarves can't be good arcane spellcasters with their ability modifiers.
If they start with a 14, they can get there by 20th level. Or more to the point, if they have a 15, they can get their by 16th.