Halloween 2017

 is an event introduced on October 26th, 2017 for the Halloween Season. Players can earn 4 different types of armors during this event, and if enough players (Android and iOS on both Global and EU Servers) receive enough of the 4 armors, the entire playerbase receives one of two additional armors. Here is a screenshot of the armors from the News Banner in-game:



The armors are as follows:


 * Heraldry of Mot - PvE Rare Drop - crafting materials for this armor can only be found by defeating the Voodoo Priest, and only in the Epic stages of Relic Ruins and Haunted Citadel. 1 crafting material (Ghost Orb) is given for using a Special Attack on the Voodoo Priest in Relic Ruins, and 2 crafting materials for using a Special Attack on the Voodoo Priest in Haunted Citadel.
 * Harvester of Anguish - Epic Boss reward - can only be earned by defeating level 40 of this Epic Boss (The Scarecrow).
 * Wraithwalker Veil - Login reward - can only be earned by logging in at least 7 times between October 25th and November 3rd (10 days).
 * Vengence Saber - Raid Boss - can only be earned by meeting the required milestone (unknown) in the Blitz Raid that occurs on Halloween.
 * Lich Soulreaver - Collection - can only be earned when over 10,000 players have 3 of the above armors, and is only given to the players who have the 3 unique armors.
 * Lich Soulharvester - Collection - can only be earned when over 10,000 players have all 4 unique armors, and is only given to the players who have all 4 armors.

Additionally, there is an "Elite" level of this reward, as follows:

Elite event: The Lich Soulreaver armor is upgraded to the Lich Soulharvester armor (~30% more stats) If 500 players have collected all 4 armors, they will receive: If 1,000 players have collected all 4 armors, they will receive: If 1,500 players have collected all 4 armors, they will receive: And for everyone: we will DOUBLE all** the community rewards If 2,000 players have collected all 4 armors, they will receive: And for everyone: we will TRIPLE all** the community rewards If 3,000 players have collected all 4 armors, they will receive: And for everyone: we will QUADRUPLE all** the community rewards If 5,000 players have collected all 4 armors, they will receive: And for everyone: we will multiply all** the community rewards by x10
 * The armor
 * 1x Silver Coins
 * The armor
 * 2x Silver Coins
 * The armor
 * 3x Silver Coins
 * The armor
 * 5x Silver Coins
 * Jewelry to go with the armor
 * The armor
 * 10x Silver Coins
 * 20 FB Air IV armors
 * Max level Jewelry
 * The armor plus (nearly 13,000 total stats)
 * 10x Silver Coins
 * 30 FB Air IV armors
 * Max level Jewelry

Full details are available here.