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The Slayer's Mask, also known as Sea Beast Helmet, is a Legendary Chroma neck accessory with a 1% drop chance from Sea Serpents at Rough Waters.

It gives +0.5% base reduced damage, + 0.5% every 75 levels with a maximum of 3%.

The level requirement to trade it is 300+.

The accessory looks like a color-variable Oni-resembling mask. It comes in 4 different colors - Red, Blue, Orange and Green, which are determined by the color of the Sea Serpent it dropped from.

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