A Tale of Youkai and the Great Serpent - Mount Ashigara

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妖怪大蛇伝 金時山
A Tale of Youkai and the Great Serpent - Mount Ashigarabanner.png
Name A Tale of Youkai and the Great Serpent - Mount Ashigara
Type Points Exchange
History 9/3/2018 - 9/17/2018
Event Cards
Feeder Materials

Dungeon Summary

Cardify Skills are disabled.

The Great Serpent Jormungandr has appeared from another world in the land of the Youkai!

Help Kintaro and company stop him!

The Boss Wood.png Jormungandr is weak to Fire.png Slash.png and Paralysis.

Youkai Cards also deal 20% additional damage in the Dungeon.


Wave 1 & 2

  • Two of either Kintaro, Shuten-doji, Urashima Taro, Hashihime, or Momotaro will appear on Wave 1.
  • Onimusha Thor and either Nure-onna or Tsuchigumo will appear on Wave 2.
    • If you defeat Nure-onna or Tsuchigumo and Thor is still alive at the end of the Turn, he'll Buff the Party +1 to all Stats and flee.


  • Jormungandr's Preemptive Attack will attack the Party and break their Shields.
  • Jormungandr will mostly attack the Party and inflict Debuffs.
    • Oroboros Break: Attack (ウロボロスブレイク:攻): Attacks the Party and may inflict Taunt + Debuffs (-3 to Stats); Will also Debuff the Party additionally.
    • Oroboros Break: Defense (ウロボロスブレイク:防): Attacks the Party and may inflict Damage UP + Strong Poison + Debuffs (-3 to Stats). Jormungandr applies an Iron Wall Shield (Overwrite Disabled)
    • Oroboros Break: Broken (ウロボロスブレイク:壊): Attacks the Party and may inflict Damage UP + Debuffs (-3 to Stats)
    • Release Attack: Jormungandr Buffs itself +10 to all Stats; On the next turn, he'll attack the Party for high damage, inflict -5 to all Stats and Strong Poison
      • The Release Attack probably won't be seen much, but watch out for it! Paralyze him to prevent it!
  • If you inflict Paralysis on Jormungandr, he'll skip his turn by curing himself, resetting his Stats, and applying a Status Immunity Shield.
    • However, Jormungandr may counterattack if you Paralyze him twice in a row.
  • Status Reflect is pretty handy to try and reflect some of Jormungandr's Debuffs; he can Debuff the Party pretty quickly otherwise.
  • Likewise, Shield Breakers or Bypassers are handy to have as well.
  • Compared to some other Event Bosses, the difficulty's a bit on the lower end and there's not much to Jormungandr's mechanics.

True Dragon King

  • The general fight and Strategy remains the same from Dragon King difficulty.
  • If you defeat Jormungandr in 3 Turns, you'll get a special Title!

Super Dragon Emperor

  • Unlike TDK, there are some significant changes here.
  • Jormungandr's Debuffs are much stronger than before (-5); be sure to pack Status Reflect/Immunity and Debuff Reversing cards!
  • Jormungandr can also Reverse your Buffs!
  • If Jormungandr begins to Charge up, Paralyze him immediately to dispel it. Otherwise, he'll deal very heavy damage to the Party (can potentially be fatal if he's fully Buffed).
  • If Jormungandr hasn't been defeated after 10 Turns, he'll start Nuking the Party for extreme damage. Try to defeat him quickly!

Recommended Cards

  • Red Slash: Coyote, Kintaro, Ibaraki-doji, etc.
  • Paralysis Cards: Nikita, Surgut, Skeggjold, Hashihime, etc.
  • Status Reflect: Star, Iroha, Hades, Hibiscus
  • Anti-Shield, Shield Breakers, or Bypassers: Kintaro, Siegfried, Izanagi, etc.

Event Cards

Point Cards

Reward Points Needed
Fire.pngSS+.png Tsuchigumo 50,000
Water.pngSS+.png Nure-onna 50,000

Special Sub Cards

When you clear the Dungeon, one of two Sub Cards may drop from the Dungeon Chest.
You'll need 12 copies each to evolve one fully to from SS to SSS.

Card Sub Skill Description
Fire.pngSSS.png Thunder Crushing Axe When Main Card is a God or Youkai and has Attack Skill, grants (25-30%/30-35%/30-40%) Skill Boost and (+1/+1-2/+2) ATK.
(SSS Only: When your ATK is lower than the target's, grants 35-40% Skill Boost instead)
Wood.pngSSS.png Thunder God Blade When Main Card has Slash Skill, grants (30/30-35/30-40%) Skill Boost
(When target is Blue, 20% chance to decrease their DEF by (1/1/2); When Main Card is Green and has Slash Skill, grants +1/1/2 ATK.)

Accumulated Point Rewards

Unlike most other Special Events, the Points you accumulated are split into two.
The first is an accumulated point total that keep tracks of all the Points you've gained total, while the other you can use to spend on fodder.

Once you've reached the appropriate Point Total, you can obtain the reward associated with it.

Point Total
3000 Gold Marrone Set
5500 100 Dragon Medals
8000 Boost Ticket Set x5
10000 S.png Princess Fairy Set
30000 SS.png Gem Marrone Set
60000 Rare Gacha Ticket x3
100000 Boost Ticket Set x5
200000 GOD.png Gem Marrone Set
300000 5 Black Medals
500000 SS.png Queen Fairy Set
600000 SS Ring Set
700000 S Gacha Ticket x2
800000 200 Dragon Medals
900000 GOD.png Goddess Fairy Set
1000000 SS Gacha Ticket


The Fodder are Potatoes; they give 2x EXP to all Event Cards including Kintaro, Thor (Onimusha), Hashihime, Urashima Taro, Momotaro (Wandering), and Shuten-doji (Strange).
They can also be used as Skill-Up Material for Slash.png Heal.png Hit.png Skills. (Skill Fairy Equivalent)

Point Rewards

  • 3 Black Medals for 10,000 P (Obtainable up to 3 times.)
  • 150 Dragon Medals for 7,500 P (Obtainable up to 3 times.)

Special Mission

There's a Special Mission for this Dungeon that you can complete to get a special Title.

Reward Condition
"Great Serpent Slayer" Defeat Jormungandr on TDK Difficulty in 3 Turns.
  • This is actually not too difficult as Jormungandr is somewhat easier than many other Event Bosses.
  • Cards like Ibaraki-doji, Kintaro, and Nikita are essential for cutting down Jormungandr quickly.
  • You can also abuse Damage UP to kill Jormungandr even faster! (It's certainly possible to kill him in one Turn given a good hand.)

Treasure Rewards & Points Earned

Difficulty Points Earned Treasure Reward
初級 (24 STP)
3000 N/A
中級 (42 STP)
5500 N/A
上級 (60 STP)
8000 10 Black Medals
鬼級 (72 STP)
10000 200 Dragon Medals
雷級 (84 STP)
12500 10 Black Medals
竜級 (96 STP)
15000 200 Dragon Medals
神級 (114 STP)
30000 10 Black Medals
Dragon King
竜王級 (132 STP)
45000 3 Goddess Fairies
True Dragon King
真竜王級 (150 STP)
60000 10 Black Medals
Super Dragon Emperor
超竜皇級 (168 STP)
120000 Forehead Jewel