ren-shen day pillar

壬 begins its twelve stages at 申. 三命通會 卷五 states the two points in one short phrase, 壬生申死卯: 壬 is born at 申 and dies at 卯. Metal also feeds water, so element relation and Growth stage line up on this page.

壬 reappears inside 申 as a Friend, next to 庚 as Indirect Resource and 戊 as Seven Killings. Most tables agree on this branch. 三命通會 assigns five days to 坤土, the earth of the 坤 direction, and never actually writes 戊 there.

劍鋒金, Metal of the Sword Edge, is the 納音, and 三命通會 卷一 writes 戈戟, halberds. It goes on 大喜子午卯酉, greatly pleased by the four branches 子, 午, 卯 and 酉. The weapon image returns in 卷二, where 申 entering 巳 and 午 is said to meet the fire: 逢火炼，遂成剑戟, forged by fire into swords and halberds.