Adamantite Knuckles

Taken all the way down to base materials, one Adamantite Knuckles is 3 crafting steps deep and needs 7 intermediates — Adamantite Nugget ×3, Larimar ×2, Aurum Regis Nugget ×1 and 4 others — which resolve to 8 distinct raw materials totalling 39 units, plus 47 crystals.

That bill outweighs 11,756 of the 13,602 recipes tracked here and 1,437 of the 1,932 Blacksmith ones, and 337 recipes nest deeper.

Only 3 of those crystals go into the final step; the other 44 are burned by the intermediates, so the real crystal cost is 15 Fire Crystal, 13 Wind Crystal, 10 Wind Shard and 4 other kinds.

The chain crosses three disciplines — Blacksmith to Lv 60, Goldsmith to Lv 58 and Weaver to Lv 54 — so no single class can finish it unaided.

All 8 raw materials are gathered, and 3 of them are time-gated: Adamantite Ore (0:00, 2:00, 6:00, 10:00, 12:00, 14:00, 18:00, 22:00), Darksteel Ore (1:00) and 1 other. The widest gap between consecutive opening times is 4 Eorzean hours, about 12 real-world minutes.

Of the intermediates, Aurum Regis Nugget has the widest use: 185 recipes call for it, spanning seven of the eight crafting classes.