Stone Interior Wall

Taken all the way down to base materials, one Stone Interior Wall is 3 crafting steps deep and needs 4 intermediates — Mortar ×4, Steel Rivets ×2, Distilled Water ×4 and 1 other — which resolve to 5 distinct raw materials totalling 26 units, plus 24 crystals.

That bill outweighs 9,543 of the 13,602 recipes tracked here and 1,329 of the 1,591 Alchemist ones, and 337 recipes nest deeper.

Only 6 of those crystals go into the final step; the other 18 are burned by the intermediates, so the real crystal cost is 11 Water Shard, 10 Fire Shard and 3 Lightning Shard.

The chain crosses two disciplines — Alchemist to Lv 30 and Blacksmith to Lv 29 — so no single class can finish it unaided.

All 5 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, Mortar has the widest use: 140 recipes call for it, spanning six of the eight crafting classes.