Steel Locker

Taken all the way down to base materials, one Steel Locker is 2 crafting steps deep and needs 2 intermediates — Chondrite Ingot ×6 and Persimmon Lumber ×3 — which resolve to 5 distinct raw materials totalling 52 units, plus 79 crystals.

That bill outweighs 12,890 of the 13,602 recipes tracked here and 1,366 of the 1,441 Armorer ones, and 4,464 recipes nest deeper.

Only 16 of those crystals go into the final step; the other 63 are burned by the intermediates, so the real crystal cost is 48 Fire Crystal, 15 Wind Crystal, 8 Earth Crystal and 1 other kind.

The chain crosses three disciplines — Armorer to Lv 90, Blacksmith to Lv 88 and Carpenter to Lv 66 — so no single class can finish it unaided.

All 5 raw materials are gathered, and one of them is time-gated: Bamboo Stick (7:00). That window comes round once per Eorzean day, every 70 real-world minutes.

Of the intermediates, Chondrite Ingot has the widest use: 210 recipes call for it, spanning seven of the eight crafting classes.