The Pulsing Caves beacon sits deep inside the Sanguine Caverns gate in Mortal Shell 2, and cleansing it is what unlocks the Mawbreak Cavern dungeon where the Blackblood Stone waits in a chest. Getting there is a linear trek that starts at Widow’s Overlook, runs through Blackridge Cliffs, and passes a corrupted gate you must open first.
Quick answer: Cleanse the Stonebled Gate beacon to open the corrupted gate, travel through the Sanguine Caverns to the Pulsing Caves beacon, rest at it to enter Mawbreak Cavern, open the stone chest for the Blackblood Stone, then destroy the corruption source and collect the Ovum to finish the cleanse.
What you need before you reach the Pulsing Caves
The path into the Sanguine Caverns gate is blocked until you cleanse the Stonebled Gate beacon. That beacon opens the corrupted gate that leads into the region, so handle it before you commit to the run. Cleansing Stonebled Gate takes you through The Hidden Keep and a fight with Lucian, the Thirsting Knight, and rewards the Serpent Stone tarstone along with a Glimpse.
Once Stonebled Gate is cleansed, set your starting point at the Widow’s Overlook beacon. From there you cross Blackridge Cliffs to reach the Sanguine Caverns, so it helps to have a ranged sidearm and a reliable melee weapon ready for the crawling and flying enemies packed along the way.
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Cleanse the beacon and clear Mawbreak Cavern
Resting at the beacon and selecting Cleanse Beacon drops you into the Mawbreak Cavern dungeon. This is the space you have to clear to finish the cleanse and reach the Blackblood Stone.

How to confirm the cleanse worked
The cleanse is complete when the screen displays Beacon Cleansed: Pulsing Caves after you collect the Ovum. Opening the Mether’s Breath fast travel map then shows the Pulsing Caves as an available destination, so you can warp back to it at any time. If the message does not appear, you still have corruption or the corruption source left to destroy, so return to the tree node and finish clearing the chamber before collecting the Ovum.
Blackblood Stone effects and compatibility
The Blackblood Stone is a Combat tarstone. Its main effect makes your projectiles explode in mid-air and deal splash damage, and it only fits the Naylshotte sidearm. The splash value scales as you level the stone up.
| Level | Splash damage from exploding projectiles |
|---|---|
| Lv. 1 | 2 splash damage |
| Lv. 2 | 3 splash damage |
| Lv. 3 | 4 splash damage |
Because it is locked to the Naylshotte, the Blackblood Stone is only worth equipping if you run that sidearm. Paired with it, every shot that detonates mid-flight adds area damage on top of the direct hit, which helps against the tight clusters of small enemies the Sanguine Caverns throw at you on the way back out.






