How to Get the Chain Gun in Terraria - Ultimate Guide

The Chain Gun can be found by beating the Frost Moon event in Terraria. To trigger this event, players must craft a Naughty Present at a Mythril Anvil or Orichalcum Anvil. To craft the Naughty Present, players will need Silk, Ectoplasm, and a Soul of Fright. Cobwebs found in Spider Caves or underground areas inhabited by Spiders can be converted into Silk at a Loom. Ectoplasm is a material dropped from Dungeon Spirits in the Dungeon biome, and the Soul of Fright is a drop from Skeletron Primes, a boss summoned with a Mechanical Skull after nightfall. The Soul of Fright is crafted using Bone, Iron Bar, Soul of Light, and Soul of Night. Once you have all the necessary resources, the Naughty Present can be crafted at a Mythril Anvil or Orichalcum Anvil.

Once the Naughty Present is crafted and placed on the ground, the Frost Moon Event will start. During this event, players must battle various monsters and bosses in a randomly generated arena. At the end of the event, the Chain Gun will be dropped as a reward.