immune to poison and telepathy

"Loup-garou," Bob said. "Or that was the name Etienne the Enchanter used for them, before he got burned at the stake. The loup-garou are the major monsters, Harry. Someone has cursed them to become a wolflike demon, and usually at the full moon. That someone's got to be really powerful, too, like a major heavyweight sorcerer or a demon lord or one of the Faerie Queens. When the full moon comes, they transform into a monster, go on a killing spree, and slaughter everything they come across until the moon sets or the sun rises. "
A sudden little chill went over me, and I shivered. "What else?"
"Supernatural speed and power. Supernatural ferocity. They recover from injuries almost instantly, if they become hurt at all. They're immune to poison and to any kind of sorcery that goes for their brain. Killing machines. "

Fool Moon Chapter 8, Page 72