Evolved from <l:4,3>Toolmaking<e> and <l:4,0>Arts<e>, Stone-Working gives bulk and reinforcement to man's earliest buildings. By cutting stone from quarries, Civilizations can construct <l:2,3>City Walls<e> to fend off enemies, or <l:8,25>Strongholds<e> to strengthen defense. Meanwhile, the <l:3,1>Sphinx<e> inspires the Civilization's military and decreases their <l:6,60>military readiness<e> costs.