Sky Rat Mask of Fending ★★★★

Taken all the way down to base materials, one Sky Rat Mask of Fending is 2 crafting steps deep and needs 3 intermediates — Cloud Mythril Ingot ×2, Grade 2 Vitality Dissolvent ×1 and Griffin Leather Strap ×1 — which resolve to 8 distinct raw materials totalling 16 units, plus 34 crystals.

That bill outweighs 6,959 of the 13,602 recipes tracked here and 1,002 of the 2,216 Goldsmith ones, and 4,464 recipes nest deeper.

Only 6 of those crystals go into the final step; the other 28 are burned by the intermediates, so the real crystal cost is 9 Fire Cluster, 7 Earth Crystal, 7 Wind Crystal and 4 other kinds.

The chain crosses four disciplines — Goldsmith to Lv 60, Alchemist to Lv 60, Blacksmith to Lv 60 and Leatherworker to Lv 60 — so no single class can finish it unaided.

3 of the 8 raw materials come out of the ground, and 2 of them are time-gated: Cloud Mythril Ore (2:00, 6:00, 10:00, 14:00, 18:00, 22:00) and Clary Sage (0:00, 20:00). The widest gap between consecutive opening times is 4 Eorzean hours, about 12 real-world minutes.

Of the intermediates, Griffin Leather Strap has the widest use: 38 recipes call for it, spanning four of the eight crafting classes.