Board Thread:General Discussion/@comment-27338732-20151203212251/@comment-24577221-20151203214818

The only trick is to keep trying. Without torches lit, you have about a 63.4% chance of getting at least one Ethereal within 100 tries -- better than half, a bit less than &#8532;. Not that unusual that you wouldn't have been successful. If you have had torches lit, that would improve your odds, and make it more surprising that you weren't successful. It appears that each torch adds approximately 1% to the original 1% per try -- I'm badly behind on analyzing and posting the data, my apologies to the "minions" and everyone else.

How many torches have you had going?