Skybuilders' Lamppost

Taken all the way down to base materials, one Skybuilders' Lamppost is 2 crafting steps deep and needs 1 intermediate — Manasilver Nugget ×1 — which resolves to 5 distinct raw materials totalling 29 units, plus 13 crystals.

That bill outweighs 10,170 of the 13,602 recipes tracked here and 1,028 of the 1,441 Armorer ones, and 4,464 recipes nest deeper.

Only 6 of those crystals go into the final step; the other 7 are burned by the intermediates, so the real crystal cost is 7 Wind Crystal, 4 Ice Crystal and 2 Earth Crystal.

The chain crosses two disciplines — Armorer to Lv 80 and Goldsmith to Lv 74 — so no single class can finish it unaided.

All 5 raw materials are gathered, and not one of their spots is timed, so nothing in the tree waits on the Eorzean clock.

Of the intermediates, Manasilver Nugget has the widest use: 83 recipes call for it, spanning seven of the eight crafting classes.