X-Ether ★★

Nothing in this list is craftable in turn, so a batch of 3 X-Ether is a single step: 3 units of material drawn from 3 base items, plus 2 crystals.

That bill outweighs 3,373 of the 13,602 recipes tracked here and 426 of the 1,591 Alchemist ones, and 9,374 recipes nest deeper.

2 of the 3 raw materials come out of the ground, and one of them is time-gated: Thavnairian Mistletoe (17:00). That window comes round once per Eorzean day, every 70 real-world minutes.

X-Ether is itself consumed by 1 further recipe, all of them Alchemist recipes.