Hearth Maul
Location
Required Items
Rewards
What the allowance actually buys
One allowance here buys 21,600 EXP, the best on the Lv 20 Blacksmith tradecraft rung — matched exactly by 3 other leves of the 6 there, with the rest trailing at 12,960 EXP or less.
On whether to wait: the best Lv 25 Blacksmith tradecraft leve returns 47,200 EXP per allowance, 119% more than the best on this rung, while the Lv 15 rung behind tops out at 18,910 EXP.
At Lv 20 this data holds 52 leves paying EXP across 2 categories: the 48 Tradecraft ones average 17,352 EXP per allowance, the 4 Fieldcraft ones 113,304 EXP, which puts this leve 24% above its own category's average.
Iron Sledgehammer ×1 is a Lv 23 Blacksmith recipe, 2 steps deep through 3 intermediates, costing 8 units of raw material and 6 crystals.
Handing that in returns 2,700 EXP and 37 gil for every unit of raw material the order swallows, and the tree needs Alchemist, Blacksmith and Carpenter.