NON-MAGICAL (Optional Dwarf Racial)
Arcane magic is anathema to dwarves; they cannot be Wizards, Sorcerers, Chaos-Mages or Necromancers. In return, they can add their Con bonus to their defense against any magic- or spell-attack.
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I've always found the idea of standard dwarves casting wizard/sorcerer spells to be a bit weird, and not in keeping with the original flavor of dwarvendom. So, for my 13th Age campaigns, I've tweaked standard dwarves with the above racial ability, which they have in addition to the "That's Your Best Shot?" racial power.