Mythril Cuirass

Taken all the way down to base materials, one Mythril Cuirass is 3 crafting steps deep and needs 4 intermediates — Mythril Plate ×2, Electrum Ingot ×1, Mythril Rings ×1 and 1 other — which resolve to 2 distinct raw materials totalling 19 units, plus 46 crystals.

That bill outweighs 7,589 of the 13,602 recipes tracked here and 733 of the 1,441 Armorer ones, and 337 recipes nest deeper.

Only 9 of those crystals go into the final step; the other 37 are burned by the intermediates, so the real crystal cost is 20 Fire Shard, 17 Ice Shard, 5 Wind Shard and 1 other kind.

The chain crosses three disciplines — Armorer to Lv 39, Goldsmith to Lv 42 and Blacksmith to Lv 38 — so no single class can finish it unaided.

One intermediate outranks the result: Electrum Ingot is a Lv 42 Goldsmith recipe feeding a Lv 39 craft, so that step, not the last one, is the real gate.

Both raw materials are gathered, and no spot for either is timed, so nothing in the tree waits on the Eorzean clock.