Once and for Alchemy
Location
Required Items
Rewards
What the allowance actually buys
One allowance here buys 1,255,600 EXP, the best of the 2 Lv 84 Armorer tradecraft leves that record EXP: the runner-up manages 933,280 EXP, 26% less.
On whether to wait: the best Lv 86 Armorer tradecraft leve returns 1,503,270 EXP per allowance, 20% more than the best on this rung, while the Lv 82 rung behind tops out at 1,582,910 EXP.
At Lv 84 this data holds 18 leves paying EXP across 2 categories: the 16 Tradecraft ones average 1,208,414 EXP per allowance, the 2 Fieldcraft ones 2,702,320 EXP, which puts this leve 4% above its own category's average.
Bismuth Alembic ×1 is a Lv 85 Armorer recipe, 2 steps deep through 2 intermediates, costing 24 units of raw material and 47 crystals.
Handing that in returns 52,317 EXP and 207 gil for every unit of raw material the order swallows, and the tree needs Armorer, Blacksmith and Goldsmith.