Iron Clapper

Taken all the way down to base materials, one Iron Clapper is 3 crafting steps deep and needs 3 intermediates — Iron Ingot ×1, Undyed Cotton Cloth ×1 and Cotton Yarn ×2 — which resolve to 2 distinct raw materials totalling 5 units, plus 4 crystals.

That bill outweighs 4,201 of the 13,602 recipes tracked here and 450 of the 1,932 Blacksmith ones, and 337 recipes nest deeper.

Only 1 of those crystals go into the final step; the other 3 are burned by the intermediates, so the real crystal cost is 2 Fire Shard and 2 Lightning Shard.

The chain crosses two disciplines — Blacksmith to Lv 16 and Weaver to Lv 13 — so no single class can finish it unaided.

One intermediate outranks the result: Iron Ingot is a Lv 16 Blacksmith recipe feeding a Lv 15 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.