Way of Dark
Ethereal - Take 1/2 damage from all non-magical attacks, but magic attacks do double damage against you.
A clear choice when facing opponents who lack magical talent. Be careful though, some clever opponents may lure you into a false sense of security, only to unleash a surprise magical secondary ability you weren't expecting. Assuming you aren't facing such foes, take a secondary ability which can enhance your melee superiority even further. As always, consider mobility for a secondary when facing thieves.
Leads to: Specter or Dread Knight