Tier 4 Aquarium ★★★★

Taken all the way down to base materials, one Tier 4 Aquarium is 3 crafting steps deep and needs 5 intermediates — Teak Lumber ×6, High Mythrite Ingot ×2, Tempered Glass ×2 and 2 others — which resolve to 15 distinct raw materials totalling 126 units, plus 87 crystals.

That bill outweighs 13,516 of the 13,602 recipes tracked here and 1,529 of the 1,552 Carpenter ones, and 337 recipes nest deeper.

Only 6 of those crystals go into the final step; the other 81 are burned by the intermediates, so the real crystal cost is 21 Ice Cluster, 21 Wind Cluster, 14 Lightning Crystal and 6 other kinds.

The chain crosses three disciplines — Carpenter to Lv 60, Alchemist to Lv 60 and Blacksmith to Lv 60 — so no single class can finish it unaided.

7 of the 15 raw materials come out of the ground, and 3 of them are time-gated: Astral Moraine (0:00, 12:00), Lumythrite Ore (2:00, 14:00) and 1 other. The widest gap between consecutive opening times is 10 Eorzean hours, about 29 real-world minutes.

Of the intermediates, High Mythrite Ingot has the widest use: 150 recipes call for it, spanning seven of the eight crafting classes.