Mythril Plate

Taken all the way down to base materials, one Mythril Plate is 2 crafting steps deep and needs 1 intermediate — Mythril Ingot ×2 — which resolves to 1 distinct raw material totalling 6 units, plus 12 crystals.

That bill outweighs 4,542 of the 13,602 recipes tracked here and 466 of the 1,441 Armorer ones, and 4,464 recipes nest deeper.

Only 4 of those crystals go into the final step; the other 8 are burned by the intermediates, so the real crystal cost is 8 Fire Shard and 4 Ice Shard.

The chain crosses two disciplines — Armorer to Lv 38 and Blacksmith to Lv 38 — so no single class can finish it unaided.

Its single raw material is gathered, and no spot for it is timed, so nothing in the tree waits on the Eorzean clock.

Mythril Plate is itself consumed by 25 further recipes, spanning two of the eight crafting classes.