Alzur's shield
From Witcher Wiki
Alzur's shield is a powerful spell which can be cast on an individual to protect them from harm. Triss Merigold casts it on Geralt on at least one occasion during the game, when she teleports the witcher to the Salamandra base in Act III. If Geralt chooses her as Alvin's guardian, she also casts this spell on him during his fight with the Grand Master's conjured minions in the Icy Plains.
