Category
There are some tunnels that even Runners fear to tread. In these places, scouts often communicate across long distances by scraping on walls, rattling bones, chittering to set up echoes, and so on. High-tanking rats don't just spread messages this way; they also listen closely to get a rough idea of the tunnels ahead, just in case they need to bolt through them. Whisper in a ventilation shaft of a big corporate building, or rattle some bones at an open sewer lid, and there's a chance you may sense a passageway you never realized was there.
System
Spend one Gnosis and roll Perception + Performance. While performing this Gift, your senses will be hyperattenuated for the duration of the scene, especially to the sounds of echoes and rustling down the system of tunnels you're using. If anyone makes a loud noise while you're in this state, you'll take one health level of non-aggravated damage.
Once you take this risk, however, you can communicate to anyone in that tunnel system. Each point of Willpower you spend allows you to relay one sentence (up to ten words in length). Any Ratkin in the tunnel might receive this message. Unfortunately, the harmonics get distorted over distance; another Tunnel Runner using this Gift won't receive the words you sent, but instead, detect a sensory image that relays the same information. This image can be intercepted by other Tunnel Runners who spend a point of Gnosis and make a successful Blood Memory roll (difficulty 8); other shapechangers, humans, or supernatural creatures just hear unearthly subterranean noises.
Even if you don't spend Willpower, you can also roll temporary Gnosis to get a sense of a section of the tunnel system. With three successes, you might also get a vision of someone stalking down there. With five successes, you may uncover a secret tunnel, an entrance to a room you need to access, or an object that has been lost or abandoned. When other shapechangers go crawling in the sewers, they learn to fear the strange echoes ricocheting around them; they foretell the apptoach of a skilled Tunnel Runner!
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