A Philodox employing this Gift can tell if anyone nearby is threatened by her, as well as the degree of her victim's fear.
In any arena of the Shattered Labyrinth, an initiate can experience the many subtle flavors and variations of fear. If he overcomes his terror, she can learn to inflict it on others. Spirits serving Hakaken and Sykora also know this Gift intimately...and teach it that way.

System: This requires a Perception + Empathy roll; the difficulty is equal to the target's Willpower. For every hour this sense is active, the Black Spiral loses one Gnosis, but as a side effect, she can also tell if anyone is using Sense Wyrm on her.

Books:
Book of the Wyrm