Harrow dared not poke her head around its bulk, and anyway she knew what she would see. Instead, she scattered a fistful of crushed ash in a wide half-circle around herself and Ortus and raised it into a jagged wall of calvarial bone, six feet high and an inch thick: the toughest and thickest posterior parietal she could manage in her pre-Lyctoral state.

Harrow the Ninth - Act Five, Chapter Forty-Nine