Tama-hagane Ingot

Taken all the way down to base materials, one Tama-hagane Ingot is 2 crafting steps deep and needs 1 intermediate — Oroshigane Ingot ×1 — which resolves to 3 distinct raw materials totalling 9 units, plus 9 crystals.

That bill outweighs 5,492 of the 13,602 recipes tracked here and 519 of the 1,441 Armorer ones, and 4,464 recipes nest deeper.

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

The chain crosses two disciplines — Armorer to Lv 66 and Blacksmith to Lv 64 — so no single class can finish it unaided.

All 3 raw materials are gathered, and not one of their spots is timed, so nothing in the tree waits on the Eorzean clock.

Tama-hagane Ingot is itself consumed by 95 further recipes, spanning six of the eight crafting classes.