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Explore the Corrupted cave - source of poison water

The party ventured into a corrupted cave to uncover the source of the poison infecting the Great Tree, battling memory-draining horrors, deranged cultists, and a monstrous psionic creature born from a churning pool. After defeating the entity and recovering strange artifacts and clues, the waters began to heal—revealing new dangers ahead and a deeper threat stirring beneath the waves.

Recap

After partially healing the Great Tree in a previous outing, the expedition set its sights on the lingering poison still seeping through the river. Chweech and Chwong insisted the source lay deeper inland - within a strange cave where the corrupted water first rose to the surface. With camp becoming a temporary home, the party gathered supplies, shared morning rituals, and prepared for what would be their darkest journey yet.

Before departure, Thalen - still shaken from the magical Darkness incident at the Great Tree on their previous expedition - approached Shadow with a vulnerable truth: he feared losing his bearings, his place in the world. Shadow agreed to teach him how to navigate the dark, revealing only a cryptic “magic” when pressed about his scars. Their training culminated in Thalen awakening as a Gloomstalker, and the two set off leading the expedition toward the strange cave.

The group followed the river until its northern fork spiraled into an arch-shaped stone cavern, where the water trickling out carried swirls of sickly purple and black. Kouzlo’s arcane senses detected something utterly alien - magic outside the eight known schools - while Aldric’s Divine Sense recoiled from a presence neither celestial, fiend, nor undead… but profoundly wrong.

Inside, a dim, eerie glow emanated from the water itself. As the cavern opened into a large circular chamber, Thalen and Aldric approached a perfectly still pool - and both immediately fell into psychic visions. Thalen relived the death of his beloved grandfather; Aldric heard the quiet disappointment of his brother. The pair stood frozen, eyes glazed, until Shadow and the others physically hauled them away from the water’s pull.

Pressed deeper by a rhythmic hum echoing through the stone, the party entered a narrow, pitch-black tunnel lined with questing, flesh-colored tentacles. They lashed out, biting into Shadow’s neck and briefly erasing a childhood memory. In a blur of claws and feline agility, Shadow gave Thalen a piggyback sprint through the writhing gauntlet to scout into the chamber ahead. After a clever use of Pass Without a Trace from Madam Helena, the group emerged unscathed into a vast cavern where the source of the chanting became clear.

A waterfall fed a churning pool at the chamber’s center. Suspended within the pool was a massive green sphere - an egg - and three robed humanoids stood nearby, chanting. Their cloaks shimmered like the night sky, dotted with pale specks. The rhythmic drone was the same pulse they had heard since entering the cave.

With Pass without Trace concealing them, Thalen and Shadow launched a devastating surprise attack. Entangling vines erupted from Thalen's magic arrow and Shadow’s Silence snuffed out the chanting. One cultist fell immediately as roots swallowed him whole.

Combat erupted across the cavern. The dwarf cultist tore himself free and summoned horrific fish-like sea spawn from the water - the same sea spawn from Aldric, Kouzlo, and Lorvial’s expedition in the cave north of camp albeit much weaker.

Aldric cleaved one in two with righteous fury. Kouzlo shattered the air with ice and lightning. The orc cultist teleported across the room and assaulted Shadow’s mind, raking him with psychic agony. But the worst came when both surviving cultists cried out, “I give myself to you,” and leapt willingly into the pool.

The water churned.

And something answered.

A creature surfaced - three-eyed, tentacled, utterly silent despite its towering presence. Two more eggs floated near it, pulsing with life. The battle was savage: Thalen’s arrows found purchase, Shadow struck with claw and blade despite waves of poison, Kouzlo’s lightning shattered an egg, and Madam Helena sanctified the chaos with holy fire and Bless.

Shadow, affected by an unknown toxin upon touching the creature, began to experience a sensation similar to drowning while standing in the cave. As his arm began to burn he made the desperate choice to dive into the water, finding relief and the ability to once again breathe in the new environment.

Aldric stood unwavering at the pool’s edge, invoking Tyr as he severed tentacles and met the creature’s unblinking gaze. When it tried to break Shadow’s mind or crush his lungs, the party rallied, dragging each other back from the brink. Finally, in a blaze of divine power, Aldric split the creature apart - its death cry echoing not through the air, but through the minds of everyone present.

Shadow’s unknown ailment passed as he rejoined a concerned Thalen and the rest of the party back on the dry land of the cave interior.

When the creature’s body collapsed and the party pulled it on land, the water slowly began to clear. The blight had been severed. The party took a number of samples of the creature with them for further examination.

As the cavern settled, the party explored its remnants:

Among the supplies, the party also recovered magical items including healing potions, arcane scrolls, a Potion of Psionic Fortitude, and the recipe for a Potion of Bottled Breath. Note - a key ingredient in the Bottled Breath potion is the Noctiluceum fungus of which Kouzlo has several sample vials. By the time the group emerged from the cavern, the mist that had once smothered the land was thinning. The river flowed clearer. The forest breathed easier.

With the source of the corruption defeated, the path beneath the Great Tree - once sealed by living vines - may now finally open.

The blight’s source is destroyed, but its origin is not.

The cultists spoke of reinforcements. The letter spoke of a ritual. The drawings spoke of something far larger - and far deeper - lurking underwater.

With the water beginning to heal, the expedition may now return to the Great Tree and investigate the previously sealed path, or prepare for the next stage of this rising threat. The stars are watching.

And something beneath the waves is waking.

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