“Hold on!” Waxillium said.

He amplified his weight.

Feruchemy didn’t work like Allomancy. The two categories of power were often lumped together, but in many ways, they were opposites. In Allomancy, the power came from the metal itself, and there was a limit to how much you could do at once. Wayne couldn’t compress time beyond a certain amount; Waxillium could Push only so hard on a piece of metal.

Feruchemy was powered by a sort of cannibalism, where you consumed part of yourself for later use. Make yourself weigh half as much for ten days, and you could make yourself one and a half times as heavy for a near-equal amount of time. Or you could make yourself twice as heavy for half that time. Or four times as heavy for a quarter of that time.

Or extremely heavy for a few brief moments.

Waxillium drew into himself weight he’d stored in his metalminds across days spent going around at three-quarters weight. He became heavy as a boulder, then as heavy as a building, then heavier. All this weight was focused on one small section of the floor.

The wood crunched, then burst, exploding downward. Waxillium dropped out of Wayne’s bubble of speed and hit real time, the shift jostling him. The next few moments were a blur. He heard the awesome sound of the explosion above—it hit with a wave of force. He released his metalmind and Pushed against the nails in the floor below them, trying to slow himself and Marasi.