Mythrite Rivets

Taken all the way down to base materials, one Mythrite Rivets is 2 crafting steps deep and needs 1 intermediate — Mythrite Nugget ×1 — which resolves to 2 distinct raw materials totalling 6 units, plus 6 crystals.

That bill outweighs 4,542 of the 13,602 recipes tracked here and 466 of the 1,441 Armorer ones, and 4,464 recipes nest deeper.

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

The chain crosses two disciplines — Armorer to Lv 51 and Blacksmith to Lv 51 — so no single class can finish it unaided.

Both raw materials are gathered, and no spot for either is timed, so nothing in the tree waits on the Eorzean clock.

Mythrite Rivets is itself consumed by 28 further recipes, spanning five of the eight crafting classes.