So in this horribly described video, I'm showing you the Tinkerer duping bug from 188.8.131.52. The way this works, from what I can tell, is that by continuously putting the weapon in the Reforge box, and taking it and attacking and putting it back in and clicking the bottom right corner, or around the hammer icon, can produce a a second duplicate of the item, while the original is in the box.
From what I can tell, it seems ineffective with the old items, it seems to work best with Chlorophyte melee weapons, and other new high tier weapons, I haven't tried it with the low tier new things, due to not having them on my world anymore, nor have I had the chance to experiment with Palladium or Orichalcum, since they weren't on my world gen, it seems effective with Titanium and new Cobalt and Mythril weapons that WEREN'T in 1.1. It's a rather random thing, since I've not experimented with it extensively, I can produce 3 in 20 seconds, or 1 in 2 minutes, keep at it and you'll get dupes.
Items come with the prefix of the original.
Items I've successfully duped so far: Chlorophyte Saber, Claymore, Partisan, Repeater (many times....) Spectre Hamaxe Bee Keeper sword True Night's Edge Mythril Cobalt new melee weapons - Pickaxe, Golden Shower Titanium Repeater, Sword, and Pickaxe Paladin's Hammer Zombie Arm
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The Goblin Tinkerer is an NPC added in the 1.1 update. He reforges items, giving them different...