Eikon Iron Grinding Wheel ★★★

Taken all the way down to base materials, one Eikon Iron Grinding Wheel is 2 crafting steps deep and needs 5 intermediates — Luminous Fiber ×3, Treated Camphorwood Lumber ×2, Eikon Iron Ingot ×1 and 2 others — which resolve to 17 distinct raw materials totalling 33 units, plus 30 crystals.

That bill outweighs 10,907 of the 13,602 recipes tracked here and 1,116 of the 1,552 Carpenter ones, and 4,464 recipes nest deeper.

Only 5 of those crystals go into the final step; the other 25 are burned by the intermediates, so the real crystal cost is 14 Wind Cluster, 6 Ice Cluster, 5 Fire Cluster and 3 other kinds.

The chain crosses four disciplines — Carpenter to Lv 60, Alchemist to Lv 60, Goldsmith to Lv 60 and Blacksmith to Lv 50 — so no single class can finish it unaided.

9 of the 17 raw materials come out of the ground, and 7 of them are time-gated: Crystallized Sap (8:00, 20:00), Meteorite (8:00, 20:00) and 5 others. The widest gap between consecutive opening times is 11 Eorzean hours, about 32 real-world minutes.

Of the intermediates, Gold Ingot has the widest use: 184 recipes call for it, spanning seven of the eight crafting classes.