Picking health orbs will increase the witch doctor's spell damage by x% for y seconds.
Primary Skills
Poison Dart • Corpse Spiders • Plague of Toads • Firebomb
Secondary Skills
Grasp of the Dead • Firebats • Haunt • Locust Swarm
Defensive Skills
Summon Zombie Dogs • Horrify • Spirit Walk • Hex
Terror
Soul Harvest • Sacrifice • Mass Confusion
Decay
Zombie Charger • Spirit Barrage • Acid Cloud • Wall of Death • Piranhas
Voodoo
Gargantuan • Big Bad Voodoo • Fetish Army
Passive Skills
Jungle Fortitude • Circle of Life • Spiritual Attunement • Gruesome Feast • Blood Ritual • Bad Medicine
Zombie Handler • Pierce the Veil • Spirit Vessel • Fetish Sycophants • Rush of Essence • Vision Quest
Fierce Loyalty • Grave Injustice • Tribal Rites • Confidence Ritual • Creeping Death • Swampland Attunement • Midnight Feast