Horse Chestnut Kasa

Taken all the way down to base materials, one Horse Chestnut Kasa is 3 crafting steps deep and needs 4 intermediates — Horse Chestnut Lumber ×2, Dark Hempen Cloth ×1, Dwarven Cotton ×1 and 1 other — which resolve to 3 distinct raw materials totalling 19 units, plus 46 crystals.

That bill outweighs 7,589 of the 13,602 recipes tracked here and 777 of the 1,552 Carpenter ones, and 337 recipes nest deeper.

Only 15 of those crystals go into the final step; the other 31 are burned by the intermediates, so the real crystal cost is 24 Wind Crystal, 15 Lightning Crystal and 7 Ice Crystal.

The chain crosses two disciplines — Carpenter to Lv 81 and Weaver to Lv 81 — so no single class can finish it unaided.

All 3 raw materials are gathered, and not one of their spots is timed, so nothing in the tree waits on the Eorzean clock.

Of the intermediates, Dwarven Cotton has the widest use: 165 recipes call for it, spanning eight of the eight crafting classes.