Slate Grinding Wheel

Taken all the way down to base materials, one Slate Grinding Wheel is 2 crafting steps deep and needs 2 intermediates — Pine Lumber ×2 and Oroshigane Ingot ×1 — which resolve to 4 distinct raw materials totalling 15 units, plus 20 crystals.

That bill outweighs 6,735 of the 13,602 recipes tracked here and 652 of the 1,552 Carpenter ones, and 4,464 recipes nest deeper.

Only 8 of those crystals go into the final step; the other 12 are burned by the intermediates, so the real crystal cost is 12 Wind Crystal, 4 Fire Crystal and 4 Ice Crystal.

The chain crosses two disciplines — Carpenter to Lv 65 and Blacksmith to Lv 64 — so no single class can finish it unaided.

All 4 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, Oroshigane Ingot has the widest use: 114 recipes call for it, spanning six of the eight crafting classes.