To be able to spawn him you need to defeat a voodoo demon in the underworld. Then build a massive pathway thing out of any un valuable block then throw the guide voodoo doll into the lava. Then this boss will spawn. Use very good armour and a good ranged powerful very ultimately effective weapon.
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Boss guide for Terraria
RandomA guide to defeating the bosses it terraria. it took ages. I hope you enjoy my first book ever. =)