Rarefied Mythril Hatchet

Taken all the way down to base materials, one Rarefied Mythril Hatchet is 2 crafting steps deep and needs 3 intermediates — Dwarven Mythril Ingot ×2, Dwarven Mythril Nugget ×1 and Lignum Vitae Lumber ×1 — which resolve to 5 distinct raw materials totalling 19 units, plus 42 crystals.

That bill outweighs 7,589 of the 13,602 recipes tracked here and 804 of the 1,932 Blacksmith ones, and 4,464 recipes nest deeper.

Only 14 of those crystals go into the final step; the other 28 are burned by the intermediates, so the real crystal cost is 21 Fire Crystal, 14 Wind Crystal and 7 Earth Crystal.

The chain crosses three disciplines — Blacksmith to Lv 80, Carpenter to Lv 78 and Goldsmith to Lv 78 — so no single class can finish it unaided.

All 5 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 Ingot has the widest use: 168 recipes call for it, spanning seven of the eight crafting classes.