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I started out with a heavier spin rod and snapped the line a few times. Once you complete phase 1, you don't need to equip the Dark Hornwort Fiber Line. Once you complete phase 1 of the monster hunt and assemble the Dark Hornwort Fiber Line, go grab a Jig Winner spinning rod with a sturdier braid line and use either #1/0 Nano Spoon or Narrow Spoon.
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Stand up against the wall with a bottom feeder rod or any rod that can use a heavy lure (56g/2oz+), aim for the highlighted red circle region and drag your heavy bait or lure (use Straight & Slow retrieve) towards you. Once the mission is over, Dark Horn again becomes scarce, and shells become common. When the monster mission active, Dark Hornwort is plentiful in one spot.
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The type of terrain for Dark Hornwort are weedy patches near rocks and tiny islands.
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