Connoisseur's Aquarium ★★★

Taken all the way down to base materials, one Connoisseur's Aquarium is 3 crafting steps deep and needs 3 intermediates — Crystal Glass ×1, Manganese Ingot ×1 and Natron ×1 — which resolve to 7 distinct raw materials totalling 13 units, plus 21 crystals.

That bill outweighs 6,426 of the 13,602 recipes tracked here and 599 of the 1,441 Armorer ones, and 337 recipes nest deeper.

Only 6 of those crystals go into the final step; the other 15 are burned by the intermediates, so the real crystal cost is 8 Fire Crystal, 5 Water Crystal, 4 Ice Cluster and 2 other kinds.

The chain crosses three disciplines — Armorer to Lv 90, Blacksmith to Lv 86 and Alchemist to Lv 50 — so no single class can finish it unaided.

5 of the 7 raw materials match a gathering node, none of them timed; the other 2 come from vendors, drops or content this site does not track.

Of the intermediates, Manganese Ingot has the widest use: 134 recipes call for it, spanning seven of the eight crafting classes.