Boundless Expanse Fountain ★

Taken all the way down to base materials, one Boundless Expanse Fountain is 2 crafting steps deep and needs 3 intermediates — Cut Stone ×15, Adamantite Nugget ×5 and Aurum Regis Nugget ×5 — which resolve to 8 distinct raw materials totalling 116 units, plus 98 crystals.

That bill outweighs 13,497 of the 13,602 recipes tracked here and 2,184 of the 2,216 Goldsmith ones, and 4,464 recipes nest deeper.

Only 3 of those crystals go into the final step; the other 95 are burned by the intermediates, so the real crystal cost is 45 Wind Shard, 25 Fire Crystal, 25 Wind Crystal and 2 other kinds.

The chain crosses two disciplines — Goldsmith to Lv 60 and Blacksmith to Lv 58 — so no single class can finish it unaided.

6 of the 8 raw materials come out of the ground, and 3 of them are time-gated: Adamantite Ore (0:00, 2:00, 6:00, 10:00, 12:00, 14:00, 18:00, 22:00), Darksteel Ore (1:00) and 1 other. The widest gap between consecutive opening times is 4 Eorzean hours, about 12 real-world minutes.

Of the intermediates, Aurum Regis Nugget has the widest use: 185 recipes call for it, spanning seven of the eight crafting classes.