Guild Wars 2: Heart of Thorns content

Caustic Paste

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Caustic Paste.png

Caustic Paste

Item type
Legendary Weapons (achievements).png Incinerator III: Spark
Account Bound
Game link

Use the cold environment found in the Underground Facility Fractal to safely react Flame Jelly with Caustic Paste at the ice pillar to form a Smouldering Concoction.

Hint: Form caustic paste by combining 10 Piles of Bloodstone Dust with the elements from an Inquest Power Core in the low-pressure environment found at the top of the Uncategorized Fractal.

— In-game description


The air is thin and chilly this high in the sky. It would be a good place to perform volatile experiments.
Talk more option tango.png Combine the Inquest Power Core with 10 Piles of Bloodstone Dust. (ends dialogue and gives Caustic Paste)
Talk end option tango.png Leave.


  • Defeating or even engaging the Raving Asura's golems is not necessary; you are prompted to combine simply upon entering the top level.
  • If you do not accept the prompt, it disappears. Simply walk away from the platform and back again to be re-prompted.