Dice Battle is an event in Cookie Run: OvenBreak, released in the first half of the Operation: Time Fixers! Update. In this event, you will battle against Cookies in a dice battle every 22 hours (you can watch an ad to fight the Cookie instanly). The rewards are 
100 for winning and 30 for losing, with some Cookies granting their own unique win rewards.
List of special win rewards Cookies[]
Round 1[]
Time Demolitionist: Gives 
300 for winning, 100 for losing. Rolling the dice will instead be a bomb and you will receive the 300 Rainbow Cubes.
Coffee Candy Cookie: Gives 200 for winning, the reward can increase to 300 if chosen "Time Crisis Response Pay Invoice" when asked about a missing file.
Poison Mushroom Cookie: Can play rock, paper, scissors instead of dice battle and gives Rainbow Cubes instead of Crystals (The Rainbow Cubes are the same amount of Crystals in normal dice battles).
Licorice Cookie: Can bet with him 300 Crystals for winning, but 10 for losing. You will need to roll the number you choose in the dice to win.
Round 2[]
Prophet Cookie: Gives 300 for winning, 100 for losing. Rolling the dice will instead be a golden fortune cookie that says "To catch the big fish, you must let go of the small fish." And you will get the 300 Rainbow Cubes
Purple Yam Cookie: Will ask for a rematch up to two times, increasing the rewards to 200 and 400 Crystals respectively.
Baguette Cookie: Gives 200 for winning, the reward can increase to 300 if chosen "Time Crisis Response Pay Invoice" when asked about what file is needed to be sent.
Snake Fruit Cookie: Can bet with them 300 Crystals for winning, but 10 for losing. You will need to roll the number you choose in the dice to win.
Other special Cookies[]
Round 1[]
Butterbear Cookie: Gives a second chance if you lost once.
Timekeeper Cookie: Gives x10 the Crystals of the number you got on the dice, but you lose all Crystals if the dice rolls 1.
Lucky Dice Bros: Is not a Cookie, but may appear as a regular challenger.
Round 2[]
Lollipop Cookie: Will ask to play again once, increasing the rewards to 200.
Backpacky: Is not a Cookie, but may appear as a regular challenger.
Fire Spirit Cookie: Gives x10 the Crystals of the number you got on the dice, but you lose all Crystals if the dice rolls 1.
Cookiemals: Can choose to either battle Choco Ring Lion Cookie, Maple Panda Cookie, or Buttershell Fox Cookie.
If chosen Choco Ring Lion Cookie: Get 100 for winning and 30 for losing.
If chosen Maple Panda Cookie: Get 100 for winning and 30 for losing.
If chosen Buttershell Fox Cookie: Get 100 for winning and 30 for losing.