Diadochos Headband of Aiming ★★★★

Taken all the way down to base materials, one Diadochos Headband of Aiming is 2 crafting steps deep and needs 4 intermediates — Garnet Cotton ×2, Grade 8 Dexterity Alkahest ×2, AR-Caean Velvet ×1 and 1 other — which resolve to 9 distinct raw materials totalling 31 units, plus 38 crystals.

That bill outweighs 10,578 of the 13,602 recipes tracked here and 1,468 of the 1,968 Weaver ones, and 4,464 recipes nest deeper.

Only 6 of those crystals go into the final step; the other 32 are burned by the intermediates, so the real crystal cost is 12 Lightning Cluster, 12 Wind Cluster, 8 Lightning Crystal and 2 other kinds.

The chain crosses three disciplines — Weaver to Lv 90, Alchemist to Lv 90 and Leatherworker to Lv 90 — so no single class can finish it unaided.

5 of the 9 raw materials come out of the ground, and 3 of them are time-gated: Field Mustard (10:00, 22:00), Lovingbloom (0:00, 12:00) and 1 other. The widest gap between consecutive opening times is 6 Eorzean hours, about 18 real-world minutes.

Of the intermediates, AR-Caean Velvet has the widest use: 136 recipes call for it, spanning six of the eight crafting classes.