Shinryu's Ephemeral Gunblade ★★

Taken all the way down to base materials, one Shinryu's Ephemeral Gunblade is 3 crafting steps deep and needs 4 intermediates — Chromite Ingot ×3, Palladium Ingot ×2, Molybdenum Ingot ×5 and 1 other — which resolve to 10 distinct raw materials totalling 71 units, plus 59 crystals.

That bill outweighs 13,309 of the 13,602 recipes tracked here and 1,872 of the 1,932 Blacksmith ones, and 337 recipes nest deeper.

Only 4 of those crystals go into the final step; the other 55 are burned by the intermediates, so the real crystal cost is 25 Fire Crystal, 12 Fire Cluster, 10 Wind Crystal and 2 other kinds.

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

6 of the 10 raw materials come out of the ground, and 2 of them are time-gated: Chromite Ore (10:00, 22:00) and Palladium Ore (4:00, 16:00). The widest gap between consecutive opening times is 6 Eorzean hours, about 18 real-world minutes.

Of the intermediates, Palladium Nugget has the widest use: 129 recipes call for it, spanning seven of the eight crafting classes.