Mailbreaker ★★

Taken all the way down to base materials, one Mailbreaker is 4 crafting steps deep and needs 5 intermediates — Hippogryph Leather ×1, Mailbreaker Blade ×1, Rose Gold Nugget ×3 and 2 others — which resolve to 6 distinct raw materials totalling 32 units, plus 26 crystals.

That bill outweighs 10,750 of the 13,602 recipes tracked here and 1,223 of the 1,932 Blacksmith ones, and 1 recipe nests deeper.

Only 2 of those crystals go into the final step; the other 24 are burned by the intermediates, so the real crystal cost is 9 Fire Crystal, 9 Wind Crystal, 3 Earth Crystal and 2 other kinds.

The chain crosses three disciplines — Blacksmith to Lv 50, Goldsmith to Lv 50 and Leatherworker to Lv 50 — so no single class can finish it unaided.

4 of the 6 raw materials come out of the ground, and 2 of them are time-gated: Darksteel Ore (1:00) and Gold Ore (9:00). The widest gap between consecutive opening times is 16 Eorzean hours, about 47 real-world minutes.

Of the intermediates, Rose Gold Nugget has the widest use: 179 recipes call for it, spanning seven of the eight crafting classes.