Koppranickel Ingot

Taken all the way down to base materials, one Koppranickel Ingot is 2 crafting steps deep and needs 1 intermediate — Koppranickel Nugget ×1 — which resolves to 3 distinct raw materials totalling 9 units, plus 6 crystals.

That bill outweighs 5,492 of the 13,602 recipes tracked here and 764 of the 2,216 Goldsmith ones, and 4,464 recipes nest deeper.

Only 3 of those crystals go into the final step; the other 3 are burned by the intermediates, so the real crystal cost is 6 Wind Crystal.

Every step is Goldsmith work, from a Lv 61 intermediate up to the Lv 62 finish, so one class covers the whole chain.

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

Koppranickel Ingot is itself consumed by 58 further recipes, spanning seven of the eight crafting classes.