Jellyfish Lamp ★★

Taken all the way down to base materials, one Jellyfish Lamp is 3 crafting steps deep and needs 2 intermediates — Silvergrace Ingot ×1 and Koppranickel Nugget ×1 — which resolve to 7 distinct raw materials totalling 15 units, plus 11 crystals.

That bill outweighs 6,735 of the 13,602 recipes tracked here and 1,233 of the 1,591 Alchemist ones, and 337 recipes nest deeper.

Only 4 of those crystals go into the final step; the other 7 are burned by the intermediates, so the real crystal cost is 3 Wind Crystal, 2 Fire Cluster, 2 Lightning Cluster and 2 other kinds.

The chain crosses two disciplines — Alchemist to Lv 70 and Goldsmith to Lv 70 — so no single class can finish it unaided.

3 of the 7 raw materials come out of the ground, and one of them is time-gated: Silvergrace Ore (8:00, 20:00). The widest gap between consecutive opening times is 12 Eorzean hours, about 35 real-world minutes.

Of the intermediates, Koppranickel Nugget has the widest use: 124 recipes call for it, spanning seven of the eight crafting classes.