Obsidian Longpole

Taken all the way down to base materials, one Obsidian Longpole is 2 crafting steps deep and needs 3 intermediates — Darksteel Nugget ×2, Jadeite ×1 and Void Glue ×1 — which resolve to 5 distinct raw materials totalling 16 units, plus 21 crystals.

That bill outweighs 6,959 of the 13,602 recipes tracked here and 1,002 of the 2,216 Goldsmith ones, and 4,464 recipes nest deeper.

Only 7 of those crystals go into the final step; the other 14 are burned by the intermediates, so the real crystal cost is 9 Fire Crystal, 5 Wind Shard, 4 Wind Crystal and 1 other kind.

The chain crosses three disciplines — Goldsmith to Lv 53, Alchemist to Lv 51 and Blacksmith to Lv 50 — so no single class can finish it unaided.

3 of the 5 raw materials come out of the ground, and one of them is time-gated: Darksteel Ore (1:00). That window comes round once per Eorzean day, every 70 real-world minutes.

Of the intermediates, Darksteel Nugget has the widest use: 121 recipes call for it, spanning seven of the eight crafting classes.