Instead of giving away 1 Free item (Undead Army), as we have done in the past, we are now giving everyone the chance to collect at least 1 Free item. The majority of the players that at the end of the event have collected between 30-38 masks would gain between 1 and 3 items. It is also possible (though very unlikely) that you won't complete the collection with 30-38 masks. It is also very unlikely that you will gain 4 or more items with 30-38 masks. It all depends on everyone's LUCK of completing the collection. The masks have all the same chance of dropping. Everyone that will have at least 10 masks at the end of the event will gain 1 additional reward.

It would be easier to give away 1 Free item to everybody, but we think that the game is more exciting this way and more rewarding for most of the players (that will gain between 1-4 items instead of just 1).