Polished Slate Grinding Wheel

Taken all the way down to base materials, one Polished Slate Grinding Wheel is 3 crafting steps deep and needs 3 intermediates — Persimmon Lumber ×2, Durium Ingot ×1 and Durium Nugget ×1 — which resolve to 5 distinct raw materials totalling 19 units, plus 28 crystals.

That bill outweighs 7,589 of the 13,602 recipes tracked here and 777 of the 1,552 Carpenter ones, and 337 recipes nest deeper.

Only 9 of those crystals go into the final step; the other 19 are burned by the intermediates, so the real crystal cost is 24 Wind Crystal and 4 Ice Crystal.

The chain crosses two disciplines — Carpenter to Lv 67 and Goldsmith to Lv 66 — 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, Durium Nugget has the widest use: 142 recipes call for it, spanning seven of the eight crafting classes.