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Caustic Grebuloff Boss (The Dead Ends)
Final Fantasy XIV: Endwalker

Caustic Grebuloff Boss (The Dead Ends)

Learn the mechanics and strategy to defeat the Caustic Grebuloff boss in The Dead Ends dungeon in Final Fantasy XIV: Endwalker. Master Miasmata, Cough Up, and more.

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Learn the mechanics and strategy to defeat the Caustic Grebuloff boss in The Dead Ends dungeon in Final Fantasy XIV: Endwalker. Master Miasmata, Cough Up, and more.

Stats / Weaknesses:

  • Caustic Grebuloff is the first boss of The Dead Ends dungeon.
  • The main challenge lies in the Miasmata mechanic.

Phases:

  1. Miasmata: After a wind direction is announced, AoE circles will appear and move in that direction. Getting hit inflicts Necrosis, a debuff that instantly kills if not cleansed. If Wave of Nausea is cast simultaneously, find a safe spot near the boss and move with the wind.
  2. Cough Up: Grebuloff drops three sets of AoEs under players. Afterward, some players receive a marker requiring them to stack. Failure to stack results in the Hysteria debuff. If followed by Wave of Nausea, players will be hit by both.
  3. Wave of Nausea: A large donut-shaped AoE. Safe spots are either very close to the boss or at the outer edges of the arena, depending on the boss's position.
  4. Pox Flail: A standard tankbuster. Tanks should use defensive cooldowns, and healers should be ready to heal.
  5. Blighted Water: A party stack mechanic. A marker appears on a random player, and the party must group up to share damage.
  6. Befoulment: A party spread mechanic. All players receive a marker, and they must move away from each other to avoid overlapping AoEs.

Strategy:

  • Pay close attention to the wind direction announced before Miasmata. Find a safe spot and slowly move with the wind to avoid the AoE circles. The Necrosis debuff from Miasmata is a near-instant kill if not cleansed. Healers should monitor debuffs.
  • When Cough Up occurs, avoid the initial AoEs and then stack with other marked players. Failure to stack leads to the Hysteria debuff.
  • For Wave of Nausea, move into the boss if close enough, or to the arena edge if a ranged DPS.
  • Use defensive cooldowns for Pox Flail and stack for Blighted Water, and spread for Befoulment.
  • Coordinate with your party to handle these mechanics effectively.

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