Energy Burn or Mana Burn is a Direct Damage type. It is reduced by Energy Resistance.
Energy Burn causes damage to the enemy energy. Like Energy Leech, Energy Burn increases by 2.5% per player level ( in Titan Quest: Anniversary Edition ), and not tied to any Attribute.
Energy Burn can also deal damage to health if a mana burn damage ratio is set to more than 0% with the spell dealing energy burn. Energy Burn Damages are reduced by Energy Resistance also.