Everything

Given their affinity to magick, mages can usually sense it when it’s been used in their vicinity. That’s especially true if that magick contains strong Resonance signatures, as described in the previous section. Depending on the mages and the magick involved, those impressions might possess a distinct smell, leave a tingling sensation in the air, or perhaps even smear the area with a greasy metaphysical residue.

In game terms, a Perception + Awareness roll can help a mage spot magickal energies within roughly 100 feet of her. Generally, the difficulty is 6, although really large Effects or strong Resonance might lower that difficulty as low as 4, while subtle ones could raise it as high as 9.