For the record, if grinds like these are the main content you have to offer in your game that doesn't even have a finished story, you're doing game development wrong.
And no, I did not stop after 100 kills. I have killed it well over 200x.
Considering the fact all 4 keys are low % drops that require long hours of grinding to begin with, the bow should be at LEAST a 50% drop.
Alternatively, all 4 keys could be 50% or higher drops.
As it is, this has to be the worst rng grind in this hot mess of a game.