Foglet mutagen is an alchemy ingredient in The Witcher 3: Wild Hunt and is used to craft Foglet 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.
- Any Foglet will drop it, however, the drop rate is pretty low so it's best to save before fighting a lone foglet, then reload until it drops.