Oasis Bathtub

Taken all the way down to base materials, one Oasis Bathtub is 2 crafting steps deep and needs 4 intermediates — Cut Stone ×6, Rose Gold Nugget ×3, Firewood ×1 and 1 other — which resolve to 6 distinct raw materials totalling 52 units, plus 42 crystals.

That bill outweighs 12,890 of the 13,602 recipes tracked here and 2,082 of the 2,216 Goldsmith ones, and 4,464 recipes nest deeper.

Only 12 of those crystals go into the final step; the other 30 are burned by the intermediates, so the real crystal cost is 25 Wind Shard, 9 Wind Crystal, 7 Fire Shard and 1 other kind.

The chain crosses three disciplines — Goldsmith to Lv 50, Culinarian to Lv 16 and Carpenter to Lv 12 — so no single class can finish it unaided.

All 6 raw materials are gathered, and one of them is time-gated: Gold Ore (9:00). That window comes round once per Eorzean day, every 70 real-world minutes.

Of the intermediates, Rose Gold Nugget has the widest use: 179 recipes call for it, spanning seven of the eight crafting classes.