Watcher's Palace Interior Wall

Taken all the way down to base materials, one Watcher's Palace Interior Wall is 3 crafting steps deep and needs 5 intermediates — Bismuth Ingot ×5, Mortar ×4, Onyx ×4 and 2 others — which resolve to 8 distinct raw materials totalling 78 units, plus 120 crystals.

That bill outweighs 13,397 of the 13,602 recipes tracked here and 2,168 of the 2,216 Goldsmith ones, and 337 recipes nest deeper.

Only 16 of those crystals go into the final step; the other 104 are burned by the intermediates, so the real crystal cost is 64 Wind Crystal, 48 Fire Crystal and 8 Water Shard.

The chain crosses three disciplines — Goldsmith to Lv 90, Blacksmith to Lv 84 and Alchemist to Lv 20 — so no single class can finish it unaided.

7 of the 8 raw materials come out of the ground, and one of them is time-gated: Raw Onyx (0:00, 12:00). The widest gap between consecutive opening times is 12 Eorzean hours, about 35 real-world minutes.

Of the intermediates, Mortar has the widest use: 140 recipes call for it, spanning six of the eight crafting classes.