To access this dungeon, you must complete the first four rooms of the Tengu Snowfoux dungeon.
Warning: the choice of the last room is final, there is no going back!
Monsters
Yomi Snowfoux
Yomi Givrefoux
Lvl 159 to 167
Yokai Snowfoux
Yokaï Givrefoux
Lvl 163 to 171
Tengu Snowfoux
Tengu Givrefoux
Lvl 170
Rooms
Room 1
Foster Fuji Snowfoux
Tengu Snowfoux
Yomi Snowfoux
Yokai Snowfoux
Boss
Foster Fuji Snowfoux ★
Fuji Givrefoux Nourricière
Lvl 190
Dungeon mechanics
The strategy I recommend is to deal with the Tengu first, so you don't get overwhelmed by its summons on such a small map; avoiding as much damage as possible and handling the Fuji alone will make things easier. For this, you absolutely need someone to slow the Fuji with MP removal and/or push it back (and the Tengu if possible), and if you can, remove its range to make it harmless! With that role assigned, the rest of the team should remove the Tengu's invulnerability within the first two turns to make the most of the small map, and kill the Tengu during the 4 turns it is vulnerable.
Be aware that, due to one of the Fuji's spells, when you kill a monster you give all opponents 2 MP for 1 turn, and the Fuji and Tengu a 1,000 damage bonus. With this in mind, make sure they cannot reach you that turn.
End of the dungeon
Once the fight is over, jump into one of the holes and follow the tunnel to exit the dungeon. You can now access the Buried Village and the Petrified Forest, home to your next obstacle: the Korriander!