Basilisk Grinding Wheel

Taken all the way down to base materials, one Basilisk Grinding Wheel is 2 crafting steps deep and needs 2 intermediates — Cobalt Ingot ×1 and Rosewood Lumber ×1 — which resolve to 4 distinct raw materials totalling 7 units, plus 22 crystals.

That bill outweighs 4,963 of the 13,602 recipes tracked here and 509 of the 1,552 Carpenter ones, and 4,464 recipes nest deeper.

Only 11 of those crystals go into the final step; the other 11 are burned by the intermediates, so the real crystal cost is 12 Wind Shard, 5 Fire Shard and 5 Ice Shard.

The chain crosses two disciplines — Carpenter to Lv 47 and Blacksmith to Lv 42 — 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, Cobalt Ingot has the widest use: 145 recipes call for it, spanning seven of the eight crafting classes.