Yin Metal over Fire · White wax metal

Xin Si — pillar 18 of 60

A blade in fire. Being worked — the most useful version of Xin, and the least comfortable to live through.

Reviewed November 2026

← All sixty pillars

Pillar辛巳 — Xin Si (18 of 60)
StemXin 辛 — Yin Metal
BranchSi 巳 — the Snake, Fire
Hidden stemsBing 丙, Geng 庚, Wu 戊
StageDeath (8 of 12)
NayinWhite wax metal
RelationBranch controls the stem

What the pair is doing

The branch restrains the stem's element — the authority relation. Pressure that comes from circumstance, rules or other people.

The stem is yin metal and the branch is fire, so this is the authority relation. Inside the branch sit the hidden stems Bing, Geng, Wu — which is why a Si branch is never only fire. Those hidden stems are what a reader checks when the surface element does not explain what the chart is doing.

The stage: Death

On the twelve-stage cycle, Xin meets Si at Death — stage 8 of twelve. The stages run from Birth at the element's own season through Peak at its strongest, then down through Decline, Illness, Death, Tomb and Severed before Conception and Nurture bring it back. Death is a qualitative marker, not a score: it says how freely the stem can act at this branch, not how strong the person is.

The nayin layer

The classical sound-element for this pair is white wax metal. Nayin is a separate sixty-item list that predates the stem-and-branch reading most charts use today; it is quoted for its image rather than its arithmetic. Treat it as a second description of the same object, not as a fifth element to be balanced.

Years with this pillar

Every sixty years the year pillar returns to Xin Si. In the current window that means 1941, 2001, 2061. If you were born in one of those years, this is your year pillar — but not necessarily your Day Master, which comes from the day, not the year.

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