Seiryu's Sanctified Katana ★★

Taken all the way down to base materials, one Seiryu's Sanctified Katana is 3 crafting steps deep and needs 3 intermediates — Chromite Ingot ×3, True Griffin Leather ×2 and Molybdenum Ingot ×5 — which resolve to 8 distinct raw materials totalling 61 units, plus 59 crystals.

That bill outweighs 13,148 of the 13,602 recipes tracked here and 1,815 of the 1,932 Blacksmith ones, and 337 recipes nest deeper.

Only 14 of those crystals go into the final step; the other 45 are burned by the intermediates, so the real crystal cost is 32 Fire Crystal, 10 Earth Cluster, 7 Earth Crystal and 2 other kinds.

The chain crosses two disciplines — Blacksmith to Lv 70 and Leatherworker to Lv 70 — so no single class can finish it unaided.

3 of the 8 raw materials come out of the ground, and one of them is time-gated: Chromite Ore (10:00, 22:00). The widest gap between consecutive opening times is 12 Eorzean hours, about 35 real-world minutes.

Of the intermediates, Chromite Ingot has the widest use: 121 recipes call for it, spanning six of the eight crafting classes.