The foxhead medallion is a ter'angreal that negates flows of saidin and saidar that contact it.

References#

• Tor Website Q&A - A side effect of the foxhead medallion is that it protects the wearer's dreams. This was not part of the intended purpose of making the medallion; it is a true side effect.
• TSR,Ch24 - Mat tells the Eelfinn that he wants his memories back, he wants to be free of Aes Sedai and the One Power, and he wants to be back in Rhuidean.
• TSR,Ch26 - When Rand leaves the glass columns in Rhuidean, he finds Mat hanging by a rope tied to the Ashandarei stuck in Avendesora. He is wearing the foxhead medallion.
• TSR,Ch37 - Mat keeps the foxhead medallion and Ashandarei when they leave Chaendaer for Imre Stand.
• TSR,Ch53 - Perrin dreams of Mat wearing the foxhead medallion.
• TFoH,Ch3 - Mat wears his foxhead medallion.
• TFoH,Ch6 - Moiraine is shocked when she tries to Heal Mat and nothing happens. She asks him to remove the foxhead medallion then Heals him.
• TFoH,Ch21 - Rand wonders what happened to Mat in Rhuidean he will not say anything except that he got the Ashandarei and the foxhead medallion.
• TFoH,Ch22 - Mat takes the foxhead medallion with him into battle. He has figured out that it blocked Moiraine's channeling when she tried to Heal him.
• TFoH,Ch42 - Mat wears his foxhead medallion to keep him safe from Aes Sedai.
• TFoH,Ch45 - Thinking of Sammael, Mat wonders if the foxhead medallion will protect him from saidin.
• TFoH,Ch54 - The foxhead medallion does not save Mat from Rahvin's lightning.
• LoC,Ch5 - Betse Silvin admires Mat's foxhead medallion.
• LoC,Ch33 - Mat wonders if the foxhead medallion will protect him against Rand.
• LoC,Ch38 - Egwene tries to wrap Mat in air. She, Elayne and Nynaeve are amazed when the flows just melt away.
• LoC,Ch39 - Elayne figures Mat has some sort of ter'angreal and is determined to study it.
• LoC,Ch44 - After dancing with Mat, Mat feels the foxhead medallion go cold and sees shock on her face.
• LoC,Ch47 - Elayne asks Mat to let her test the foxhead medallion but he refuses. She and the other Aes Sedai experiment on it from afar and determine that they can throw stuff at him with the One Power.
• ACoS,Ch22 - Elayne is determined to understand Mat's foxhead medallion.
• ACoS,Ch38 - When Mat's foxhead medallion falls against the Gholam's face the medallion burns it severely.
• WH,Ch15 - While Mat is laid up with his broken leg and ribs, his clothes disappear. All he has left is his black scarf, hat and the foxhead medallion.
• WH,Ch16 - When the Gholam attacks Mat, he uses the foxhead medallion again and burns it three more times.
• CoT,Ch1 - The foxhead medallion does not go cold when the sul'dam inspects Mat's party as they leave Ebou Dar.
• CoT,Ch28 - Mat knows from the foxhead medallion that the Aes Sedai have been channeling.
• KoD,Ch7 - When Mat feels the foxhead medallion go cold, he enters the Aes Sedai wagon and spanks Joline. They are shocked that their weaves disappear when they touch him. Setalle Anan is especially intrigued.
• KoD,Ch8 - Mat can tell the Aes Sedai are channeling when the foxhead medallion goes cool.
• KoD,Ch9 - The Aes Sedai with Mat found the loophole of the foxhead medallion. Joline often pelts him with rocks, but only when Fen and Blaeric are with her. Setalle Anan asks him about it and he lets her hold it.
• KoD,Ch11 - Thinking about the Gholam, Mat knows he still has a weapon against it.
• ToM,Ch8 - Mat wears the foxhead at all times while he is in Caemlyn.
• ToM,Ch9 - Mat uses the foxhead to fend off the Gholam when it attacks.
• ToM,Ch19 - As part of the deal to manufacture dragons, Mat loans Elayne the foxhead for three days for study.
• ToM,Ch23 - Elayne makes a copy of the foxhead, though it does not work as well as the original.
• ToM,Ch23 - Elayne is attacked and injured. Doilin Mellar makes off with the copy but Elayne still has the original.
• ToM,Ch24 - Elayne returns the foxhead to Mat.
• ToM,Ch29 - Elayne has another copy of the foxhead that she made.
• ToM,Ch31 - Mat uses the original foxhead as well as two more copies in his final battle with the Gholam.
• ToM,Ch52 - Elayne and Birgitte both have copies of the foxhead when they Travel to Cairhien. Elayne has had limited success in making copies since she gave the original back to Mat.