Dragonskin Boots of Healing

Taken all the way down to base materials, one Dragonskin Boots of Healing is 2 crafting steps deep and needs 5 intermediates — Dragon Leather ×2, Dhalmel Leather ×1, Grade 1 Mind Dissolvent ×1 and 2 others — which resolve to 9 distinct raw materials totalling 26 units, plus 32 crystals.

That bill outweighs 9,543 of the 13,602 recipes tracked here and 1,336 of the 1,844 Leatherworker ones, and 4,464 recipes nest deeper.

Only 9 of those crystals go into the final step; the other 23 are burned by the intermediates, so the real crystal cost is 19 Earth Crystal, 8 Wind Crystal, 4 Water Crystal and 1 other kind.

The chain crosses three disciplines — Leatherworker to Lv 57, Alchemist to Lv 54 and Goldsmith to Lv 54 — so no single class can finish it unaided.

6 of the 9 raw materials come out of the ground, and one of them is time-gated: Volcanic Rock Salt (17:00). That window comes round once per Eorzean day, every 70 real-world minutes.

Of the intermediates, Rubber has the widest use: 191 recipes call for it, spanning four of the eight crafting classes.