Bismuth Gunblade

Taken all the way down to base materials, one Bismuth Gunblade is 2 crafting steps deep and needs 4 intermediates — Bismuth Ingot ×2, Phrygian Gold Ingot ×2, Chloroschist Whetstone ×1 and 1 other — which resolve to 6 distinct raw materials totalling 33 units, plus 63 crystals.

That bill outweighs 10,907 of the 13,602 recipes tracked here and 1,266 of the 1,932 Blacksmith ones, and 4,464 recipes nest deeper.

Only 15 of those crystals go into the final step; the other 48 are burned by the intermediates, so the real crystal cost is 32 Wind Crystal, 24 Fire Crystal and 7 Earth Crystal.

The chain crosses three disciplines — Blacksmith to Lv 84, Goldsmith to Lv 84 and Carpenter to Lv 82 — 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, Bismuth Ingot has the widest use: 104 recipes call for it, spanning six of the eight crafting classes.