Dwarven Mythril Ring

Taken all the way down to base materials, one Dwarven Mythril Ring is 3 crafting steps deep and needs 4 intermediates — Dwarven Cotton ×1, Dwarven Mythril Nugget ×1, Iridescent Silk Thread ×1 and 1 other — which resolve to 5 distinct raw materials totalling 14 units, plus 31 crystals.

That bill outweighs 6,557 of the 13,602 recipes tracked here and 907 of the 2,216 Goldsmith ones, and 337 recipes nest deeper.

Only 14 of those crystals go into the final step; the other 17 are burned by the intermediates, so the real crystal cost is 14 Wind Crystal, 10 Lightning Crystal and 7 Fire Crystal.

The chain crosses two disciplines — Goldsmith to Lv 80 and Weaver to Lv 78 — 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, Dwarven Cotton has the widest use: 165 recipes call for it, spanning eight of the eight crafting classes.