Underground Treasure Chest 15



Underground Treasure Chest (地下に眠る千両箱) involves exploring the vast area beneath Osaka Castle and collecting Koban. To enter, select the event banner from the sortie page.

Event Period: 09 October 2019 (Wed) 14:00 until 29 October 2019 (Tue) 12:59 Japan Standard Time.

Related events:
 * Other Underground Treasure Chest events

Latest Changes
 * Increase amount of Koban attainable:-
 * Koban boxes will occasionally drop from defeating the boss nodes on all the floors.
 * The amount of Koban obtained from the first clear of floors 1 to 49 has been increased.

How to Play

 * This event is to investigate the mysterious dimension under the Osaka Castle and collect koban.
 * The event is accessible via the event banner in the Front Lines.
 * This event has underground floors from 1 to 99. You can collect Koban by clearing the boss node on each floor, and by stepping on normal map nodes.
 * Event missions are available which will award rewards for completion.
 * When you repeat the floors and clear the boss node, you can choose the "Continue Investigation" button to repeat the same floor, or "Return to Citadel" to return.

Transfer Token
Using this item will let you skip to the boss node.
 * There is a chance that the Transfer Token will drop after defeating the boss node.
 * Some Transfer Tokens are available as clear rewards from some floors
 * If you disconnect or lose game access after you used the Transfer Token but before you choose the battle formation for the boss node, upon restarting the game, if you choose to not continue with the event, you will still lose the Transfer Token which was used.

Osaka Castle Underground Floor Map
10 floors from the floor you have last accessed will be accessible upon purchase of the Floor Map and can only be used up till Floor 41.
 * The effect of the Floor Map will be instantaneous upon your purchase from the shop, i.e. you will immediately be able to access the next 10 floors from whichever floor you reached in the event map at the time of purchase.
 * After you cleared Floor 41, the Osaka Castle Underground Floor Map in the Shop shall no longer be accessible.
 * You will receive the completion rewards for the 10 floors you have skipped in your inbox.
 * The multiplier effects of Hakata Toushirou and his kiwame will not take effect on the koban completions rewards obtained using the Floor Map.

In the Event of Internet Disconnections
During the event, if the game is interrupted due to connection issues, it may be possible to continue playing from where the interruption occurred after logging in again within 24 hours of the disconnection.

Tips

 * After defeating the boss on each floor, you will automatically proceed to the next floor.
 * Troop count is restored at the end of each floor, as if one had returned to the citadel at the end of a map.
 * Enemy strength and floor difficulty increase every 10 floors.
 * Swords accumulate fatigue as they progress through floors.
 * All floors within the event are normal day maps. Ootachi and Naginata have an advantage, however putting Tantou in your team will slightly increase the chances of stepping on resource nodes.
 * You can obtain special clear rewards for clearing specific floors.
 * Konnosuke will give reminder hints on the floors where specific swords may drop from defeating the boss nodes.

Missions
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Rewards
The following rewards are given for clearing each floor of the Underground Treasure Chest map.

Floors
SECTION Underground Treasure Chest 12/Floor 1 - 50|Floor 1 - 50 Underground Treasure Chest 12/Floor 51 - 99|Floor 51 - 99
 * Floor 1 - 50
 * Floor 51 - 99