User blog comment:Filheinz/What has Yorick done?/@comment-2089069-20130704163232/@comment-9518244-20130704172450

By the way the reveal reads, it seems very likely that the Nemesis is either from or inhabits the Shadow Isles, as it reads something along the lines of "the Shadow Isles were terrible, nothing we hadn't dealt with before, until we met him". So it seems he met him on the Isles.