Talk:Void Keys/@comment-72.220.205.158-20130606052703/@comment-67.167.127.18-20130606214706

It's not 15% total chance. Every time you get a chance to claim and exit, it rolls 1 reward from the loot table. If you're in a low-level system, that's an 8.84% chance to get a tier 1 key. 4.92% for a tier 2 in a mid-level system. And only a .15% chance for a tier 3 in a high level system.

So if you ran 158 five wave multiples, and all of those missions were in Eris and Pluto, on average you should have gotten .0015 * 158 = .237. Or you shouldn't have gotten any keys at all.

If you ran those in mid-level, .0492 * 158 = 7.7726, or about 8 keys.

And if you ran them all at low level (killiken, Io, etc.)  that woul be .0884 * 158 = 13.9672, or about 14 keys.

But I can't tell without an idea of where you played those defense waves whether you got lucky, unlucky, or you did as well as can be expected.