Doman Iron Culverin

Taken all the way down to base materials, one Doman Iron Culverin is 2 crafting steps deep and needs 4 intermediates — Oroshigane Ingot ×3, Black Firesand ×1, Durium Nugget ×1 and 1 other — which resolve to 8 distinct raw materials totalling 31 units, plus 30 crystals.

That bill outweighs 10,578 of the 13,602 recipes tracked here and 1,210 of the 1,932 Blacksmith ones, and 4,464 recipes nest deeper.

Only 8 of those crystals go into the final step; the other 22 are burned by the intermediates, so the real crystal cost is 16 Fire Crystal, 7 Wind Crystal, 4 Earth Crystal and 1 other kind.

The chain crosses four disciplines — Blacksmith to Lv 65, Goldsmith to Lv 64, Carpenter to Lv 62 and Alchemist to Lv 32 — so no single class can finish it unaided.

All 8 raw materials are gathered, and not one of their spots is timed, so nothing in the tree waits on the Eorzean clock.

Of the intermediates, Durium Nugget has the widest use: 142 recipes call for it, spanning seven of the eight crafting classes.