absorbs ambient magi

In the shadows of the Bean behind us gathered the malks and Black Dogs, the rake and the ogre, the gnomes and double dozens of the viciously mischievous Little Folk of Winter.
Before us, the Sidhe abruptly began to chant and sing, gesturing with their hands as they did. Flickers of light glittered over the cohort in a dome. Shapes and sigils, runes and formulae, crackled briefly in the air, as two hundred sorcerers gathered their power from the hyperenergetic air.
What the hell? I held up my staff, opening the channels to the energy storage structures inside, and drew that energy down into it. The task normally took an hour of intense concentration and exhausting effort, when I had to provide the energy for the staff myself. With the air gone mad with power, the staff charged in seconds, which should not have been possible, not without the excess energy overflowing into waste heat and burning the thing to a crisp.
Instead, it simply let out a low hum, the runes carved into glowing green-gold, and the faint, excellent scent of scorched wood edged the night.

Battle Ground Chapter 27, Page 246-247