Mailbreaker Blade ★★

Taken all the way down to base materials, one Mailbreaker Blade is 3 crafting steps deep and needs 3 intermediates — Rose Gold Nugget ×2, Darksteel Ingot ×1 and Darksteel Nugget ×2 — which resolve to 4 distinct raw materials totalling 23 units, plus 15 crystals.

That bill outweighs 8,647 of the 13,602 recipes tracked here and 956 of the 1,932 Blacksmith ones, and 337 recipes nest deeper.

Only 2 of those crystals go into the final step; the other 13 are burned by the intermediates, so the real crystal cost is 6 Fire Crystal, 6 Wind Crystal, 2 Fire Cluster and 1 other kind.

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

3 of the 4 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.

Mailbreaker Blade is itself consumed by 1 further recipe, all of them Blacksmith recipes.