I see a few interesting combos for a life build. Warrior of Peace for sure, with all those debuffs, and Helmet Kharafax (mmm bloodlust), pelacor conjurer, truthspeaker (as you mentioned), or Evelyn Auvera before even delving into the Mercenaries you could pair up with her. I almost forgot Angel of Light.

Edit to add after looking into it, I only see Chaos Agent, Lord Arianthus, and G Cube in neutrals that look like they'd be a particularly badass combo.