Mounted Box Shelf

Taken all the way down to base materials, one Mounted Box Shelf is 2 crafting steps deep and needs 2 intermediates — Oak Lumber ×3 and Steel Ingot ×2 — which resolve to 3 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 7 of those crystals go into the final step; the other 13 are burned by the intermediates, so the real crystal cost is 13 Wind Shard, 4 Fire Shard and 3 Ice Shard.

The chain crosses two disciplines — Carpenter to Lv 33 and Blacksmith to Lv 26 — so no single class can finish it unaided.

All 3 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, Steel Ingot has the widest use: 125 recipes call for it, spanning seven of the eight crafting classes.