There are two kinds of items in battle, one appears in the match-3 area, one shows at the bottom of your screen, their effects show below:
All the special items need to be eliminated by making matches next to them twice.
Chest: Increase one chance of special item at the bottom of your screen.
Ice Block: No special effects.
Devil Fruit: Deal damage to all monsters according to their maximum health.
You can only use these special items when you eliminated some chests in the match-3 area, all these four items share the same count of use.
Firecracker: Remove a certain block on your screen.
Horizontal Rocket: Remove a certain column of blocks on your screen.
Vertical Rocket: Remove a certain row of blocks on your screen.
Rainbow Prism: Shuffle the entire board and charge a part of all heroes' skill points, without triggering any special items on the board.