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170425 eventosakabanner

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: 4 April 2018 (Wed) 17:00 until 17 April 2018 (Tue) 12:59 Japan Standard Time.

17 Apr 2018 13:00 +0900 until event's over!

Related events:

How to Play Edit

  • 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.
  • In rare instances, Hakata Toushirou, Gotou Toushirou, Shinano Toushirou, Houchou Toushirou and Mouri Toushirou will drop from the boss nodes on specific floors.
  • Mouri Toushirou's drop rate has been improved! For every 10th floor further down the castle, Mouri Toushirou's drop rate increases!
  • Mouri Toushirou will only drop once from this event. Even if you have obtained Mouri Toushirou from previous events, you can obtain one more copy from this event.

Special ItemsEdit

Transfer TokenEdit

Shop-TransferToken6

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 MapEdit

Shop-UTCFloorMap

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 DisconnectionsEdit

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.

Notes Edit

  • There is no level limit for experience gain.
  • Kebiishi will not appear.
  • You are able to repeat any floor you want, as many times as you want.
  • All clear rewards will be sent directly to your inbox. Please be mindful of the expiry date.
  • If you return to the citadel in the middle of a map, you will restart from the beginning of that floor.
  • Having Hakata Toushirou on your team will increase koban by 1.5x, Hakata Toushirou (Kiwame) by 2x. Any koban rewards received because of Hakata will be in green text.

Tips Edit

  • 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.
    • Since you cannot confirm fatigue levels during sortie, it is recommended to return to citadel at regular intervals to monitor fatigue.
  • 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 Edit

Mission Name

Mission-FrontLines

Content Reward
Charcoal Steel Coolant Grindstone Other
大阪城の地下10階を攻略せよ Clear Floor 10 of Osaka Castle Underground. 100 100 100 100 -
大阪城の地下20階を攻略せよ Clear Floor 20 of Osaka Castle Underground. 250 250 250 250 -
大阪城の地下30階を攻略せよ Clear Floor 30 of Osaka Castle Underground. 500 500 500 500 -
大阪城の地下40階を攻略せよ Clear Floor 40 of Osaka Castle Underground. 750 750 750 750 -
大阪城の地下50階を攻略せよ Clear Floor 50 of Osaka Castle Underground. 1000 1000 1000 1000 -

Mission Name

Mission-FrontLines

Content Reward
Charcoal Steel Coolant Grindstone Other
大阪城の敵部隊を50回撃破 Engage in battle with the enemy in Osaka Castle Underground and win 50 times. 100 0 0 0 Help Token x1
Light Infantry (Gold) x1
Archers (Gold) x1
大阪城の敵部隊を100回撃破 Engage in battle with the enemy in Osaka Castle Underground and win 100 times. 0 100 0 0 Help Token x1
Heavy Infantry (Gold) x1
Catapult (Gold) x1
大阪城の敵部隊を150回撃破 Engage in battle with the enemy in Osaka Castle Underground and win 150 times. 0 0 100 0 Plum Ofuda x1
Light Infantry (Gold) x1
Archers (Gold) x1
大阪城の敵部隊を200回撃破 Engage in battle with the enemy in Osaka Castle Underground and win 200 times. 0 0 0 100 Help Token x1
Heavy Infantry (Gold) x1
Catapult (Gold) x1
大阪城の敵部隊を250回撃破 Engage in battle with the enemy in Osaka Castle Underground and win 250 times. 200 0 0 0 Help Token x1
Light Infantry (Gold) x1
Archers (Gold) x1

Mission Name

Mission-FrontLines

Content Reward
Charcoal Steel Coolant Grindstone Other
大阪城の敵部隊を300回撃破 Engage in battle with the enemy in Osaka Castle Underground and win 300 times. 0 200 0 0 Help Token x1
Shieldmen (Gold) x1
Musketeers (Gold) x1
大阪城の敵部隊を350回撃破 Engage in battle with the enemy in Osaka Castle Underground and win 350 times. 0 0 200 0 Bamboo Ofuda x1
Shieldmen (Gold) x1
Musketeers (Gold) x1
大阪城の敵部隊を400回撃破 Engage in battle with the enemy in Osaka Castle Underground and win 400 times. 0 0 0 200 Travel Kit
大阪城の敵部隊を450回撃破 Engage in battle with the enemy in Osaka Castle Underground and win 450 times. 300 0 0 0 Spearmen (Gold) x1
Elites (Gold) x1
大阪城の敵部隊を500回撃破 Engage in battle with the enemy in Osaka Castle Underground and win 500 times. 0 300 0 0 Travel Garb

Mission Name

Mission-FrontLines

Content Reward
Charcoal Steel Coolant Grindstone Other
大阪城の敵部隊を550回撃破 Engage in battle with the enemy in Osaka Castle Underground and win 550 times. 0 0 300 0 Help Token x2
Heavy Calvary (Gold) x1
大阪城の敵部隊を600回撃破 Engage in battle with the enemy in Osaka Castle Underground and win 600 times. 0 0 0 300 Pine Ofuda x1
Shieldmen (Gold) x1
Musketeers (Gold) x1
全ての任務を達成せよ Clear all other event missions. 10001000 1000 1000 Letter Set

Rewards Edit

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

Floor Reward Item Floor Reward Item Floor Reward Item Floor Reward Item
Floor 1 Koban x300
Transfer Token x1
Floor 26 Koban x340
Request Token x1
Floor 51 Charcoal x51 Floor 76 Steel x76
Floor 2 Koban x300 Floor 27 Koban x340 Floor 52 Steel x52 Floor 77 Coolant x77
Floor 3 Koban x300
Request Token x1
Floor 28 Koban x340
Request Token x1
Floor 53 Coolant x53 Floor 78 Whetstone x78
Floor 4 Koban x300 Floor 29 Koban x340 Floor 54 Whetstone x54 Floor 79 Charcoal x79
Floor 5 Koban x300 Floor 30 Koban x340
Light Cavalry (Gold) x1
Floor 55 Charcoal x55 Floor 80 Steel x80
Koban x800
Floor 6 Koban x300
Request Token x1
Floor 31 Koban x360 Floor 56 Steel x56 Floor 81 Coolant x81
Floor 7 Koban x300 Floor 32 Koban x360 Floor 57 Coolant x57 Floor 82 Whetstone x82
Floor 8 Koban x300 Floor 33 Koban x360 Floor 58 Whetstone x58 Floor 83 Charcoal x83
Floor 9 Koban x300 Floor 34 Koban x360 Floor 59 Charcoal x59 Floor 84 Steel x84
Floor 10 Koban x300
Sage Dango x1
Floor 35 Koban x360 Floor 60 Steel x60
Koban x600
Floor 85 Coolant x85
Floor 11 Koban x320 Floor 36 Koban x360
Request Token x1
Floor 61 Coolant x61 Floor 86 Whetstone x86
Floor 12 Koban x320 Floor 37 Koban x360 Floor 62 Whetstone x62 Floor 87 Charcoal x87
Floor 13 Koban x320 Floor 38 Koban x360 Floor 63 Charcoal x63 Floor 88 Steel x88
Floor 14 Koban x320 Floor 39 Koban x360 Floor 64 Steel x64 Floor 89 Coolant x89
Floor 15 Koban x320 Floor 40 Koban x360
Heavy Infantry (Gold)
Floor 65 Coolant x65 Floor 90 Whetstone x90
Koban x900
Floor 16 Koban x320
Request Token x1
Floor 41 Koban x380 Floor 66 Whetstone x66 Floor 91 Charcoal x91
Floor 17 Koban x320 Floor 42 Koban x380 Floor 67 Charcoal x67 Floor 92 Steel x92
Floor 18 Koban x320 Floor 43 Koban x380 Floor 68 Steel x68 Floor 93 Coolant x93
Floor 19 Koban x320 Floor 44 Koban x380 Floor 69 Coolant x69 Floor 94 Whetstone x94
Floor 20 Koban x320
Light Infantry (Gold) x1
Floor 45 Koban x380 Floor 70 Whetstone x70
Koban x700
Floor 95 Charcoal x95
Floor 21 Koban x340 Floor 46 Koban x380
Help Token x1
Floor 71 Charcoal x71 Floor 96 Steel x96
Floor 22 Koban x340 Floor 47 Koban x380 Floor 72 Steel x72 Floor 97 Coolant x97
Floor 23 Koban x340 Floor 48 Koban x380 Floor 73 Coolant x73 Floor 98 Whetstone x98
Floor 24 Koban x340 Floor 49 Koban x380 Floor 74 Whetstone x74 Floor 99 Charcoal x99
Floor 25 Koban x340 Floor 50 Koban x10000
Background x1
Floor 75 Charcoal x75

FloorsEdit


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