Bone Knapping
From A Wiki in the Desert
Sources
Taught at the School of Architecture at Level 7 and requires mastery of all 7 levels of Flint Blade Fabrication.
Cost
You must master Flint Blade Fabrication before learning. "You must first master all 7 levels of Flint Blade Fabrication."
(bring some Flint and Slate to practice Flint Blade Fabrication if training both skills)