Impervium armor. I blame Alpha balance issues. They have been retweaking damage and levels and sorts, so it makes things kinda screwy at higher levels.
Also much obliged 0x90! Just wanted to give you a heads up.
[Edited by malhavoc431, 12/14/2013 8:27:09 AM]
Probably because the game updated to "Offended Koala"? Just a hunch.
Pretty sure 'let' isn't going to feature in the calculation.