Edit: This has been solved. It is indeed once a week on 34 and 35, with an apparent showing factor of needing at least one Skolas completion.
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Edited by DukeMonty: 8/28/2015 5:14:54 PMOn a per attempt basis One Skolas down, no Cipher. 18 completed 34 PoE, 1 Cipher. By week: 10 total weeks doing 34: 1 drop. 1 week trying (and beating) Skolas: 0 drops.