I don't know if this is intentional or not, but the Witches Hourglass's Elsari Coven effect does not increase the number of rounds a champion stays cursed. For instance, if I have only the Hourglass out, enemies who enter a dead magic zone get Cursed 2, but if I have the Hourglass + another witch out, then they are still only Cursed 2, instead of the expected 4.