You can get this set by getting the Pygmy staff off of Plantera the Jungle Hardmode boss as a drop. The Witch Doctor will actually start selling it once you obtain the staff. It'll increase the damage of your minions by 30% and lets you summon 5 additional Pygmies , enjoy!
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The Tiki Armor is an armor set for those who want a lot of strong minions to fight for them...