Hardsilver Ingot

Taken all the way down to base materials, one Hardsilver Ingot is 2 crafting steps deep and needs 1 intermediate — Hardsilver Nugget ×1 — which resolves to 3 distinct raw materials totalling 10 units, plus 9 crystals.

That bill outweighs 5,754 of the 13,602 recipes tracked here and 801 of the 2,216 Goldsmith 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 9 Wind Crystal.

Every step is Goldsmith work, from a Lv 54 intermediate up to the Lv 56 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.

Hardsilver Ingot is itself consumed by 117 further recipes, spanning seven of the eight crafting classes.