Yamashi Tekko ★★★

Taken all the way down to base materials, one Yamashi Tekko is 3 crafting steps deep and needs 4 intermediates — Ground Sloth Leather ×4, True Linen ×2, Veteran Tree Sap ×2 and 1 other — which resolve to 10 distinct raw materials totalling 37 units, plus 26 crystals.

That bill outweighs 11,564 of the 13,602 recipes tracked here and 1,713 of the 1,844 Leatherworker ones, and 337 recipes nest deeper.

Only 4 of those crystals go into the final step; the other 22 are burned by the intermediates, so the real crystal cost is 8 Wind Cluster, 6 Earth Cluster, 6 Lightning Cluster and 2 other kinds.

The chain crosses three disciplines — Leatherworker to Lv 70, Alchemist to Lv 70 and Weaver to Lv 70 — so no single class can finish it unaided.

4 of the 10 raw materials come out of the ground, and 2 of them are time-gated: Hardened Veteran Tree Sap (4:00, 16:00) and Hingan Flax (2:00, 14:00). The widest gap between consecutive opening times is 10 Eorzean hours, about 29 real-world minutes.

Of the intermediates, Twinthread has the widest use: 109 recipes call for it, spanning six of the eight crafting classes.