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Arachas mutagens is an alchemy ingredient in The Witcher 3: Wild Hunt and is used to make arachas decoction. They act like lesser green mutagens when placed in the diamond-shaped slots in the character panel.

Notes

  • In an undocumented change for Patch 1.08, all mutagen icons were changed. However, there was still a bug for those on Steam and Origin that didn't reflect this and was later fixed in Patch 1.22. Despite this, some may still see the original icons instead, even with a fully patched game.
  • It seems that only venomous arachas drop this mutagen.
    • You can find one northwest of the Druids' Camp.
    • The arachas you encounter during Contract: Skellige's Most Wanted is also a venomous arachas, even though it's name says otherwise, which can also drop this mutagen.
    • There is a venomous arachas with a chance to drop the mutagen in the cave associated with Hidden in the Depths.
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