Sky Rat Ironclad Boots of Aiming ★★★★

Taken all the way down to base materials, one Sky Rat Ironclad Boots of Aiming is 3 crafting steps deep and needs 6 intermediates — Cloud Mythril Ingot ×1, Grade 2 Dexterity Dissolvent ×1, Griffin Leather Strap ×1 and 3 others — which resolve to 9 distinct raw materials totalling 21 units, plus 52 crystals.

That bill outweighs 8,152 of the 13,602 recipes tracked here and 780 of the 1,441 Armorer ones, and 337 recipes nest deeper.

Only 6 of those crystals go into the final step; the other 46 are burned by the intermediates, so the real crystal cost is 14 Earth Crystal, 8 Earth Cluster, 7 Fire Crystal and 6 other kinds.

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

5 of the 9 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.