Heavy Metal Ingot ★★★★

Taken all the way down to base materials, one Heavy Metal Ingot is 2 crafting steps deep and needs 1 intermediate — Wolfram Ingot ×2 — which resolves to 5 distinct raw materials totalling 11 units, plus 12 crystals.

That bill outweighs 5,999 of the 13,602 recipes tracked here and 555 of the 1,441 Armorer ones, and 4,464 recipes nest deeper.

Only 6 of those crystals go into the final step; the other 6 are burned by the intermediates, so the real crystal cost is 5 Earth Cluster, 4 Fire Cluster and 3 Ice Cluster.

The chain crosses two disciplines — Armorer to Lv 60 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 2 of them are time-gated: Tungstite (2:00, 14:00) and Ferberite (3:00). The widest gap between consecutive opening times is 12 Eorzean hours, about 35 real-world minutes.

Heavy Metal Ingot is itself consumed by 20 further recipes, spanning four of the eight crafting classes.