Monster skill

Monster skills are skills used by monsters or NPCs in Guild Wars that are unique to those monsters. They cannot be learned (through Skill Trainers) or captured (through a signet) by players. Also, Mesmers can't "steal" them with spell theft or mimicking skills like Arcane Thievery.

Skills used by NPCs
In addition to skills specific to monsters, some NPCs who accompany players as allies in Guild Wars have unique skills that cannot be learned. These are: