Talk:Nekros/Prime/@comment-29603575-20160826145647/@comment-1886501-20160826222522

If 4 players have radiant relics, then chances that at least one will be a rare is actually 34%. So 3 runs on average, 1 if your lucky, 5 if your unlucky. At 11 runs the chances are 99%, so you'd have to be extraordinarily unlucky to need more than 10 runs. You can see all the chances on the Void Relic page.

Also, interestingly, the chances that at least one will be a specific uncommon (there are 2 unccommons in a relic, I presume you're going for a specific one) with 4 radiant relics is 59% (a calculation I had to do myself) so you may need multiple runs to get the neuroptics too.

It's all RNG though. When I went for the systems, the first 2 runs I got nothing, the third run there were 2 systems to choose from, which is apparently a 1% chance for a single run. If only I could've taken both...