Basilisk mutagen is an alchemy ingredient in The Witcher 3: Wild Hunt and is used to craft basilisk decoctions. They act like lesser blue mutagens when placed in the diamond-shaped slots in the character panel.
- 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.
- Southwest of the Lighthouse there is a guarded treasure on a small island. The treasure is guarded by a basilisk which has a good chance to drop this mutagen.
- It appears that basilisks always drop this mutagen, most likely because there is no contract for a basilisk, thus there would be no guaranteed source.
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