Steel Sledgehammer

Taken all the way down to base materials, one Steel Sledgehammer is 2 crafting steps deep and needs 3 intermediates — Fish Glue ×1, Steel Ingot ×1 and Walnut Lumber ×1 — which resolve to 4 distinct raw materials totalling 8 units, plus 11 crystals.

That bill outweighs 5,254 of the 13,602 recipes tracked here and 529 of the 1,932 Blacksmith ones, and 4,464 recipes nest deeper.

Only 6 of those crystals go into the final step; the other 5 are burned by the intermediates, so the real crystal cost is 5 Fire Shard, 3 Earth Shard, 2 Wind Shard and 1 other kind.

The chain crosses three disciplines — Blacksmith to Lv 30, Carpenter to Lv 25 and Alchemist to Lv 10 — so no single class can finish it unaided.

All 4 raw materials are gathered, and not one of their spots is timed, so nothing in the tree waits on the Eorzean clock.

Steel Sledgehammer is itself consumed by 1 further recipe, all of them Blacksmith recipes.