Caustic Grebuloff is the first Boss that Final Fantasy XIV players will encounter in The Dead Ends, a Level 90 Light Party Dungeon which becomes accessible once Endwalker's final MSQ, "Endwalker," has been completed. While this enemy isn't exactly the most challenging of the Bosses throughout the Dungeon, several mechanics might confuse players, causing them and their party members to end the battle in an untimely wipe in FFXIV: Endwalker.
Therefore, it is crucial that Dungeon delvers of The Dead Ends have a general understanding of Caustic Grebuloff's abilities and powers if they wish to progress onward through the instance. First, the ability that the Boss will open the fight with is Miasmata. Gusts of wind will begin to blow in a particular direction as Grebuloff charges up its cast. A plague will then descend upon the area, spawning multiple orbs covering the room with AoE circles. These orbs will follow the trajectory of the wind, so players must be sure to position themselves in the pocket spaces of safety about the arena.
Final Fantasy XIV Healers should note that if a party member is struck by one of the plague orbs during Miasmata, they will be inflicted with Necrosis. This status effect must be Cleansed immediately; otherwise, that player will momentarily reach zero HP.
Defeating The Caustic Grebuloff Boss In FFXIV
Caustic Grebuloff's next ability is Cough Up, during which three sets of puddle AoEs fall from above. Before Cough Up concludes, the Boss will inflict the party with Craven Companionship, which players can dispel by stacking close together. This mechanic is followed by Wave of Nausea, a simple donut AoE covering the entire room except for the Boss's location. Next, Caustic Grebuloff will cast Miasmata again and include a follow-up Wave of Nausea. After a few moments, the Boss will then execute Pox Flail, a tank-busting ability that will require the Healer to time their Spells effectively for sufficient HP regen on the Dungeon party's tank in FFXIV.
The next attack is Blighted Water, a stack marker requiring players to assemble and brace for incoming damage. Caustic Grebuloff's final ability is Befoulment, which functions oppositely to Blighted Water, forcing players to disperse and evenly spread out individual damage taken. After Befoulment, Grebuloff will repeat all the same abilities, casting them in a similar order. Once players have defeated this Boss, they will be rewarded with a random Earring or Necklace from "The Last" gearsets.
Final Fantasy XIV is available on PlayStation 3, PlayStation 4, PlayStation 5, and PC via Steam or Square Enix's official website.