All I get is armor pieces and negative space sword. I'm not going to spend time upgrading armor just cause it looks different. I want weapon rolls.
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The drops you get are RNG, but every week you complete the dungeon and get a new piece of the Moonfang set, that piece gets added to the drop pool for the other chests in the dungeon. That means the more you run the dungeon, the more you're reducing the chances of having a weapon drop. There's nothing to fix, and the only thing you can do is more runs through the dungeon.
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I got a gun in it yesterday so it's not glitched