There is a very first life / beginner friendly Fvs + Warlock (Acolyte of the skin) build floating out there. Off memory:
Tiefling Cha/Con
Aots x2, Fvs x5, Aots, Fvs x12
You use the close wounds sla, chain blasts and utterdark blasts in tainted scholar, pick up strong pack and feigned health. At 8 you get the cone blast and then focus on Angel of Vengeance tree.