The Halloween game mode (now Christmas themed) is a game mode which rewards players with candy, which can be used to originally buy EXP III, Ruffy (Zambe) (Nightmare from One Piece) and Pumpkin Capsules. Candy can now be used to buy Ice Marine, Water Bender and Snow Capsules (Aokiji from One Piece and Tobirama from Naruto Shippuden). Ice Marine costs 45,000 candy, Water Bender costs 20,000 and Snow Capsules cost 4,000 candy.
You can buy chests with Weapons which will be able to be used for future events, as well as the Halloween one. Chests cost either 50 gems or 300 gems. The 50 gem one has a drop rate of 80% common, 20% uncommon, while the 300 has 60% uncommon, 35% rare, 5% epic as well as an epic pity every 10 opens.
These weapons can be fused by combining three of the same type and rarity up to legendary. Certain weapons will also be more effective on certain units. For example, Zaruto (Path) will deal more damage with the Dagger.
Defeating stages has a chance to drop Shard Essence. Shard Essence is used to upgrade your weapons, making them more powerful. There is a total of 50 stages with every ten having a different boss. The bosses are Expert Sorcerer at stage 10, Crona from Soul Eater at 20, Medusa also from soul eater at 30, Lava Moth at 40, and lastly Ghost Girl at stage 50. Defeating Ghost girl rewards you with a currently unknown mega rare reward with question mark.