In case you were wondering, you have a: [1-(Chances of NOT getting drop / Drop Rate)^(Number of monsters killed)] * 100 percent chance of receiving the item for X monsters killed. Let's translate this into Tormented demons. Let's say the drop rate is 1/175 (much closer than 1/275, i believe). If you have a goal of killing 500 tormented demons, you have a: [1-(274/275)^500]*100 = 83.82% chance of getting claws within those 500 kills. If you up that to a goal of 1000 tormented demons, your chances are significantly increased, at a probability of 97.38%.