Precusor
Strangely it seems the wiki doesn’t have anything. Normally they have tables tracking drop rates for various things, but I suppose with precursors it’s hard to do.
To get accurate data you have to record all your drops from any situation that could award that item. So for example recording everything you get from every player you kill in WvW.
“Life’s a journey, not a destination.”
- place four lvl 80 exotic weapons into mystic forge
from what I’ve been able to collect from other people’s research (mostly on reddit), this drop rate is roughly 1 in 127 attempts (508 exotics) = 0.787%.
the rare → precursor seems to be a bit less likely than you would expect: 1 in 785 attemps (3140 rares) = 0.127%
the numbers required to get a a good sample size for this are astronomical, and these numbers would only be considered ballpark approximations (around 77 precursors crafted to generate this data)
Mystic’s Gold Profiting Guide
Forge & more JSON recipes