Halloween Raid Event!
Halloween Raid Event! is a series of one quest in Kingdom Hearts Unchained χ / Union χ, in which players could summon a Red Trident Tail, and collect Raid Coins to unlock the Pumpkin Head and Seasoned Wielder Bonus Avatar Boards. It was available from October 17 to 23, 2016 in the English version.
Level 90 Red Trident Tails would drop a 6★ Halloween Sora Medal.