The Chieftain is focused around fire damage with attacks and totems. He can greatly enhance the utility of his totems, making them more resilient, taunting enemies they hit, and weakening nearby enemies, or boost his own fire damage with physical-to-fire damage conversion. The Chieftain also boasts endurance charge generation and a large amounts of life regeneration and life leech through the fire damage he and his totems deal, making him surprisingly tough to kill in the heat of combat.
Chieftain boasts 50% physical-to-fire damage conversion and high Fire Penetration. No matter Molten Strike or Tectonic Slam, Chieftain can completely convert physical damage to elemental damage.
From these factors, Chieftain is a powerful option if you prefer pure fire damage Build. In defence, he is easy to gain endurance charge through the fire damage he and his totems deal. And the tree offers bonuses to endurance charge, which greatly enhance life regeneration and its attack.