Forgotten Tales

What is the drop rate for exoskeletons? Is it 1/100 or 1/1000. I've killed several hundred Pharaoh Spiders and only gotten one drop. Am I unlucky with a 1/100 drop or very lucky with a 1/1000 drop?

i believe it is 1/100, but also believe theres luck involved(sometimes you hit the 1% drop chance easier than other times).

Thanks. I figured luck was a factor. I've just been on a run of bad luck with drops in general right now. Oh, well.