Acutally I think the + Mastery Chance is not Mastery Book success but Mastery exp from crafting or what not.

Did the math on this, with finding out the /cheapest/ way to exploit this:


Costs 600,000 mesos for 180 Fatigue, if you use the cheapest potion/fatigue ratio, the below are listed in terms of Fatigue cost (3.3k per fatigue) + material cost (sum of materials)

Bronze Arrows:
Cost per craft: 50.2k

Opal arrows:
Cost per craft: 24k

Opal = 7.4k
Bronze = 33.6k

If Opal Arrows give at least half of the mastery, they are more economical... at my level 8 Smithing, they give 142 and 164, respectively.

So... crafting the Opal ones is BY FAR cheaper, and you wasted a lot of mesos. I will be investigating whether there is a cheaper method and how much it costs exactly to go 1-10 BS.

Eh, so maybe I went the more expensive route, lol. Props to ya if you found a cheaper way to save mesos. I honestly never looked into which would be cheaper, just went with bronze and stuck with it.

Also, confirmed that the double mastery chance is actually the chance you have to get double the mastery increase after crafting something. So, at lvl100 diligence, you end up saving around 10% of the fatigue cost when crafting a sufficiently large amount of items.