Mythrite Bladed Lantern Shield

Taken all the way down to base materials, one Mythrite Bladed Lantern Shield is 3 crafting steps deep and needs 4 intermediates — Mythrite Ingot ×3, Darksteel Nugget ×2, Mythrite Rivets ×2 and 1 other — which resolve to 4 distinct raw materials totalling 48 units, plus 43 crystals.

That bill outweighs 12,691 of the 13,602 recipes tracked here and 1,340 of the 1,441 Armorer ones, and 337 recipes nest deeper.

Only 7 of those crystals go into the final step; the other 36 are burned by the intermediates, so the real crystal cost is 36 Fire Crystal, 4 Ice Crystal and 3 Earth Crystal.

The chain crosses two disciplines — Armorer to Lv 53 and Blacksmith to Lv 52 — so no single class can finish it unaided.

All 4 raw materials are gathered, and one of them is time-gated: Darksteel Ore (1:00). That window comes round once per Eorzean day, every 70 real-world minutes.

Of the intermediates, Darksteel Nugget has the widest use: 121 recipes call for it, spanning seven of the eight crafting classes.