Warning Spoiler Alert: This article or section contains details about plotlines not covered in the anime. Do not proceed unless you wish to be spoiled.

Feral Warder Chief (フィーラル・ワーダーチーフ, Fīraru Wādā Chīfu?) was the boss guarding a field dungeon on the 40th Floor of Aincrad in Sword Art Online. The boss had two Hit Point (HP) bars.[1]


The Feral Warder Chief was a large jailer monster, in which its head is hidden by a steel mask. Its main weapon consisted of a terrifyingly huge two-handed axe. The monster was only a little over two-meters tall, seeming far smaller when compared to dragon or golem-type boss monsters.[1]

Attack PatternsEdit

The Warder Chief's attack pattern only consisted of physical attacks with its axe, with no area of effect, breath or shock wave attacks; however, differently from the Ruthless Warder Chief, when near death, the boss was capable of using an area of effect attack by gripping its large axe with both hands and making a full rotation with its body as if it were in shot put, assailing the huge tip of the axe in a low trajectory. The direct attack of the techinique would lead into a paralysis debuff.[1]

Boss BattleEdit


The strategy used by the group of players was to either dodge or block the Feral Warder Chief's attacks and, upon getting an opening, launch up to two-hit Sword Skills, in order to not suffer any lethal counterattacks.


  • On October 16, 2023:
  • Nautilus charges at the boss's left knee with his «Rage Spike».
  • After dodging the monster's counterattack, Nautilus instructs the curved sword user and his comrades to handle its minions.
  • Taking up positions, Nautilus and the two Fuurinkazan members stand in the front and pull the jailer's aggro while the groups at the sides attack the boss.
  • Using the opening created, the attackers proceed to pound the monster with their Sword Skills. The Warder Chief's first HP bar visibly decreases.
  • The Warder Chief's second HP bar cut down to fifty percent.
  • Evading the boss's two-hit attack, Nautilus counterattacks with his «Snake Bite». The Warder Chief's HP bar changes from yellow to orange.
  • The Warder Chief's HP bar is reduced to twenty percent, entering the red zone.
  • Reiforcement minions spawn, totaling twenty tormentors in the boss room.
  • The boss uses an area of effect techinique, breaking the three clearers' posture and successfully paralising five other players.
  • After throwing a recovery potion to one of the paralysed players, Yuna begins running while singing and playing her flute.
  • Both the tormentors and the boss target the singing Yuna. The two Fuurinkazan members deal heavy blows on the boss's legs.
  • Being unable to save Yuna due to his FullDive Non-Conformity, Nautilus presences the death of his childhood friend's death.
  • Suffering a fierce attack form the Fuurinkazan members, The Feral Warder Chief is defeated.


  1. 1.0 1.1 1.2 Hopeful Chant Part 5
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