Where to next?

[Creslyn]

Started a new toon, chose warfare to begin with. Currently at level 12 just past the sacred grove, heading to Delphi.

TitanCalc

Got him equipped with the Labryinthine set (those horns look ridiculous ), a nice Deathweavers Legtip, Deathrattle artifact, and some stat jewellery.

Have three skill points to spend and not sure where to go from here. Max out Warwind and/or Onslaught, or push the mastery higher to get to Ardor and Ancestral Horn, or start on a second mastery? (Likely be spirit, seems the best way for a dual wielder to survive in later difficulties).

Haven't really had any trouble yet, apart from constantly needing to chug health pots, but that's ok, that's why god invented them. Which path should I take, and why?