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Phosphor Trench
Sunken Caldera
The Sovereign commands the vent floor, the Skulk strikes from ash, and the Crusher blocks the passage.
Phosphor Trench cuts through a sunken volcanic caldera where geothermal vents spew pale yellow vapor. The rift floor stays dark except for the dull green luminescence of hunting bulbs. Brittle basalt crust cracks underfoot, revealing deep seams of glowing mineral ash.
Three predators claim the thermal vents. The Phosphor Sovereign commands the basalt floor, dragging heavy iron-hard pincers and raising a glowing venom bulb. The Cinder Skulk burrows beneath warm ash, waiting to fling barbed tail darts into exposed joints. Guarding the chokepoints, the Basalt Crusher locks travelers in its heavy claws while the vent heat burns away their stamina.
The pack isolates intruders by collapsing ground and pinning front-line fighters. At the rift opening, the Basalt Crusher moves first to block the narrow path and lock the lead warrior in its pincer. The Cinder Skulk lurks hidden under gravel, launching darts at healers or spellcasters who hang back.
Once an intruder is trapped, the Phosphor Sovereign strides into the thermal steam. It vents searing gas to scatter rescuers, then brings its tail forward to deliver caustic venom. The pack does not chase prey across open ground. They hold the warm stone of the trench and let the volcanic heat sap their quarry.
Example encounter
1. Put the Basalt Crusher at the narrow rift opening, the Cinder Skulk submerged under basalt gravel, and the Phosphor Sovereign thirty paces out on the vent floor.
2. On the Crusher's first spotlight, attack the lead traveler with Heavy Anvil-Claw and force a Strength Reaction Roll (15) to Restrain them in Vise Grip.
3. While a foe is held in Melee with the Crusher, use Chitin Wall to grant nearby allies +1 Difficulty against ranged attacks.
4. When a target is pinned, stride the Phosphor Sovereign into Melee and attack with advantage using Crushing Pincer.
5. Spend a Fear on Glowbulb Stinger against a pinned foe to inflict 3d8+3 magic damage and make them Vulnerable.
6. While a target is Vulnerable, spotlight the Cinder Skulk from hiding to attack with advantage and deal +1d8 physical damage with Exploit Agony.
7. If rescuers cluster within Close range, mark a Stress on the Sovereign for Sulfur Vent to blast them back to Far range with scalding gas.
