Manor Marching Horn ★★★

Taken all the way down to base materials, one Manor Marching Horn is 3 crafting steps deep and needs 3 intermediates — Darksteel Plate ×4, Mahogany Lumber ×4 and Darksteel Nugget ×8 — which resolve to 4 distinct raw materials totalling 39 units, plus 59 crystals.

That bill outweighs 11,756 of the 13,602 recipes tracked here and 1,247 of the 1,441 Armorer ones, and 337 recipes nest deeper.

Only 3 of those crystals go into the final step; the other 56 are burned by the intermediates, so the real crystal cost is 24 Fire Crystal, 20 Wind Shard, 12 Ice Crystal and 2 other kinds.

The chain crosses three disciplines — Armorer to Lv 50, Blacksmith to Lv 50 and Carpenter to Lv 39 — so no single class can finish it unaided.

2 of the 4 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.