High Durium Katana

Taken all the way down to base materials, one High Durium Katana is 2 crafting steps deep and needs 4 intermediates — High Durium Nugget ×3, Dark Hempen Cloth ×1, Dwarven Mythril Nugget ×1 and 1 other — which resolve to 6 distinct raw materials totalling 31 units, plus 61 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 15 of those crystals go into the final step; the other 46 are burned by the intermediates, so the real crystal cost is 32 Fire Crystal, 14 Wind Crystal, 8 Lightning Crystal and 1 other kind.

The chain crosses three disciplines — Blacksmith to Lv 81, Weaver to Lv 81 and Goldsmith to Lv 78 — so no single class can finish it unaided.

All 6 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, Dwarven Mythril Nugget has the widest use: 154 recipes call for it, spanning seven of the eight crafting classes.