Plumed Mythril Pickaxe

Taken all the way down to base materials, one Plumed Mythril Pickaxe is 3 crafting steps deep and needs 4 intermediates — Mythril Ingot ×1, Oak Lumber ×1, Undyed Linen ×1 and 1 other — which resolve to 4 distinct raw materials totalling 9 units, plus 19 crystals.

That bill outweighs 5,492 of the 13,602 recipes tracked here and 597 of the 1,932 Blacksmith ones, and 337 recipes nest deeper.

Only 8 of those crystals go into the final step; the other 11 are burned by the intermediates, so the real crystal cost is 8 Fire Shard, 4 Earth Shard, 4 Lightning Shard and 1 other kind.

The chain crosses three disciplines — Blacksmith to Lv 38, Weaver to Lv 33 and Carpenter to Lv 32 — 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.

Of the intermediates, Mythril Ingot has the widest use: 135 recipes call for it, spanning seven of the eight crafting classes.