The game mode will be available in version 15.40 in all States.

“ | Defeat scores of Infected monsters in the Colosseum and push your fighting abilities to the limit | ” |
Event Rules[]
- The Alliance leader or R4 members can place the Colosseum in the Alliance Territory
- After the building is placed, Chiefs can take on challenges against the monsters there.
- A powerful monster will appear every 5 levels. You can request for help from other players in the alliance working together to kill it
- The event is open 2 days a week (Monday and Tuesday), and rewards are issued at the end of each week according the the highest solo and alliance level completed
- A season generally lasts 12 weeks; at the end of each season the level progression and monster difficulty will be reset.
- Within a season, the level cap will rise as the event progresses
How to Play[]
1: Build Colosseum[]
The Alliance leader or R4 members can place the Colosseum inside Alliance Territory. After the building is placed, Chiefs can head to the building and tap Summon to challenge it.

2: Level Challenge[]

There are two types of levels, Normal and Elite. An enhanced monster will appear every 5 normal levels, and Chiefs can request help from alliance members to defeat the monsters together. For example, if level 15 is unlocked, Chiefs will encounter strong enhanced monsters.
Elite levels have been newly added to the current version. Chiefs can unlock the corresponding Elite levels according to their Alliance's Normal level completion progress. Chiefs will only be rewarded when they pass an Elite level for the first time. Repeatedly completing Elite levels that have already been cleared will not result in additional rewards! Also, Elite levels are more difficult than Normal levels and Chiefs are not allowed to request help from allies in Elite levels.
3: Help Stickers[]

Chiefs who are unable to complete an enhanced level can send stickers in the Alliance to ask for help, after which, the helper and the requester will form two-person squads and launch a Rally to defeat the powerful enemy together.

The alliance member who assists in defeating the level will receive a mutual aid crate. Each member of the alliance can give a maximum of 20 assists to players and will receive a mutual aid crate for each of these assists.
4: Opening Time & Duration[]
The event is open every Monday and Tuesday. A season generally lasts 12 weeks. At the end of each season, the level progression and monster difficulty will be reset. During the season, the level cap will be unlocked weekly in a sequential manner.

Credits to Arabella of Sunsets
Rewards[]
The event lasts for two days, Monday and Tuesday each week. On Wednesday, rewards will be issued according to the highest solo and alliance level completed.
Solo Rank[]
The following are the solo rewards obtained after defeating the monster per max level. The rewards are not accumulated for each level, the player receives the rewards for the max level completed.
Alliance Rewards[]
At the end of the event, Rewards will be sent to the Rewards Stash based on the players highest completed level.
There are 15 rank levels for alliance rewards. The rank level is determined based on the amount of players in the alliance that unlock a specific amount of levels in the Normal mode of Flash Duels.
Elite solo mode unlocks based on the alliance rank levels.
Specific hero fragment rewards are based on stage age and generation level.
The following are the alliance rewards obtained
ELITE FLASH DUELS[]
In this mode the monsters are unlocked as the alliance rank increases in the event.
Rewards are gradually unlocked based on the damage dealt in a single hit. Monsters are restored to full Health if not killed in a single hit.
-146.The Banished Fighter
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