Hingan Mansion Roof (Kura-zukuri)

Taken all the way down to base materials, one Hingan Mansion Roof (Kura-zukuri) is 3 crafting steps deep and needs 9 intermediates — Cobalt Joint Plate ×20, Mortar ×20, Darksteel Plate ×15 and 6 others — which resolve to 10 distinct raw materials totalling 445 units, plus 600 crystals.

Nothing tracked here carries a heavier raw-material bill: it outweighs all 13,601 other recipes, the other 1,440 Armorer ones included, and 4,126 others are the same 3 steps deep.

Only 40 of those crystals go into the final step; the other 560 are burned by the intermediates, so the real crystal cost is 275 Fire Crystal, 100 Fire Shard, 100 Ice Shard and 3 other kinds.

The chain crosses three disciplines — Armorer to Lv 68, Blacksmith to Lv 68 and Alchemist to Lv 20 — so no single class can finish it unaided.

All 10 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, Cobalt Ingot has the widest use: 145 recipes call for it, spanning seven of the eight crafting classes.