Shackles of Pain - A targeted spell that will link the damage the player takes to that character as long as they do not have any physical armor.Decaying Touch - A touch-based spell that deals physical damage and sets decay on a character without physical armor for two rounds.Blood Sucker - An AOE based around the player that heals them based on how much blood is around the player.
Each of these builds will be much stronger with added padding of the Fighter's starting skill lines. Three great options are to add Necromancer for a similar build to the Inquisitor, Pyrokinetic for a similar build to the Wizard, or Polymorph for a similar build to the Shadowblade. Outside of the main two skill lines, just about any skill line can be added to this class. Like most other classes in this game, the Fighter can be very flexible with other added skill lines.