Mary was the one who dealt the final blow, thrusting a rusted rapier through the monster’s heart. After that, a harrumphing blast of air buffeted all nearby. Not only did this great exhalation knock down the Hedge walls here (leaving half-of-a-beach in its wake, all blasted sands and briny pools), but all of the creature’s kept treasures peppered the area that became known as the Blasted Beach.
It was a concussive piñata, a shimmering grenade. Some of the trifles acted like shrapnel, killing a few of the attendant changelings, and we don't know for sure if O'Brine was able to survived the blast.
- Dancers in the Dusk, p. 91