A toxin with a delayed activation time - it is especially dangerous because of its ability to completely disable magical powers for a limited time.
“Bastards! They must have slipped it into my ale at the tavern earlier” Triss thought to herself, in a fleeting moment of clarity amidst the drug-fueled haze. They had lured her to an abandoned farm with lies about Geralt’s whereabouts. Her desperation to locate the man she loved proved to be her undoing. Normally she would have incinerated the assailants in the blink of an eye, but the toxin had kicked in by then. Upon regaining some of her clarity, she realized that she was in some damp jail cell. They had been ravaging her for some time and every hole of the redheaded sorceress was dripping with cum from the rabble now surrounding her.