The Festering Core

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Glass and Time icon.png This page describes content which is not available in the game.
"The Festering Core" was moved into the Destiny Content Vault in Beyond Light season icon.pngBeyond Light.
The Festering Core
The Festering Core Strike banner.png
Location Io
Players 1-3
Power 750
Expansion Shadowkeep season icon.pngShadowkeep
Enemies Vex, Taken
Boss Baurisk, Envoy of Savathûn (Taken Incendior)
Description Descend into the heart of Io's Pyramidion and root out a burgeoning infestation.

The Festering Core is a strike located on Io.


Enemies Encountered



The Rupture

Head north towards the structure and defeat Vex in your way. Keep following the waypoints through narrow corridors.

The Endless Gate

You will be attacked by a big wave of Goblins, aided by some Harpies and Fanatics. Use walls as a shield and fight them off. You will enter an area with a sphere-like object. Just keep jumping from platform to platform while fighting Goblins, Hobgoblins and Harpies until you reach the white light. It will release energy and a Hydra will spawn. Defeat it and go through the portal.

Shoot down Goblins and a Taken Wizard as they battle each other. At the bottom, you will encounter more Goblins and Harpies, some Hobgoblin snipers, a Taken Wizard, a Taken Centurion and a Cyclops. The Cyclops will try to lock players in detaining fields, which slow down and deal damage over time, so take it out first. Proceed through the cave carefully. A batch of Fanatics will spawn on your way to the second Cyclops, shoot them before they spread. The rest of the way is a platforming section filled with various Vex. Keep pushing, and you will find a giant Vex sphere. To get inside, you need to destroy 4 Vex Lenses while fighting off the Vex. The Lenses are shielded, so you have to stand on plates to remove the shields. There are 2 plates in this area, each covers 2 Lenses. After the Lenses are destroyed, you have to shoot an additional Lens in front of the barrier, and you can enter the sphere.

Once inside, turn left and proceed in that direction, avoiding the red moving grids, they deal damage. Push through the waves of the Taken and the Vex. Eventually, you will encounter another Vex barrier you need to disable. Stand on 2 plates, destroy 4 Lenses and the additional one, defeat the elite Taken Centurion and go through the entrance you unlocked.

Go deeper and fight off more Taken until you encounter another Vex Barrier. This time, you will be attacked by Taken Wizards. Remove the barrier and descend to the bottom of the core where you will need to destroy a Taken Blight. This will summon the boss, Baurisk, Envoy of Savathûn.

Baurisk, Envoy of Savathûn

Baurisk will remain mobile throughout the fight. His main weapon of choice is the Cabal Magma Launcher that shoots numerous projectiles. Occasionally, Baurisk will summon Void Fireballs that deals explosive AOE damage. Do not stand too close to him, as he will use a Quake attack that launches you away and deals huge damage.

After he loses a third of his health, Baurisk will unleash a powerful AOE attack and shield himself from incoming damage. Vex reinforcements will spawn, you need to clear them out to remove Baurisk's shield. Repeat this process until Baurisk is defeated.


  • Sometimes this strike bugs out. The objective changes mid-strike to "Descend into the Pyramidion" (which is an objective from The Pyramidion), and no enemies spawn in the boss room, including the boss. The players have to restart the activity when this happens.

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Warmind The Insight TerminusStrange TerrainWill of the Thousands
Forsaken Warden of NothingThe CorruptedBroodholdThe Hollowed Lair
Shadowkeep The Scarlet KeepThe Festering Core
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Destiny Content Vault
Destinations The FarmTitanIoMercuryMars
Vendors Tyra KarnSloaneAsher MirBrother VanceAna BrayBenedict 99-40Werner 99-40Visage of Calus
Activities AdventuresNightfall StrikesEscalation ProtocolForge IgnitionsGambit PrimeThe ReckoningThe MenagerieThe Tribute Hall
Missions The WhisperNiobe's TormentZero HourThe Other Side
Strikes Savathûn's SongThe PyramidionA Garden WorldTree of ProbabilitiesStrange TerrainWill of the ThousandsThe Festering Core
Raids LeviathanEater of WorldsSpire of StarsScourge of the PastCrown of Sorrow
Crucible Modes SupremacyCountdownLockdownBreakthroughDoublesScorched
Crucible Maps MeltdownFirebase EchoSolitudeLegion's GulchRetributionEquinoxGambler's RuinEmperor's RespiteThe Citadel
Gambit Maps Cathedral of ScarsKell's Grave