Carbuncle Rug ★★★

Taken all the way down to base materials, one Carbuncle Rug is 2 crafting steps deep and needs 4 intermediates — Hippogryph Leather ×4, Raptor Leather ×4, Jute Yarn ×2 and 1 other — which resolve to 6 distinct raw materials totalling 26 units, plus 47 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 3 of those crystals go into the final step; the other 44 are burned by the intermediates, so the real crystal cost is 20 Earth Shard, 12 Earth Crystal, 6 Lightning Crystal and 3 other kinds.

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

2 of the 6 raw materials come out of the ground, and one of them is time-gated: Raw Ruby (18:00). That window comes round once per Eorzean day, every 70 real-world minutes.

Of the intermediates, Hippogryph Leather has the widest use: 131 recipes call for it, spanning seven of the eight crafting classes.