Hold the Twin Siphons | Fantasy Hazard Generated by CharGen

The hazard

The Twin Siphons are a linked battlefield hazard built to punish anyone who tries to hold the central ground. They seize a creature's momentum and vitality, then drag it toward one of the two towers while their partner siphon lashes the exposed position. The machinery groans like a pair of enormous lungs. When one tower falters, the other becomes visibly less precise, making the hazard a tactical problem that rewards splitting attention between offense and sabotage.

Complex
Mechanical
Magical

Stealth: (expert) to notice the concealed conduits and concealed trigger lattice; the towers themselves are obvious once seen.
Trigger: The hazard rolls initiative when a creature enters the central 40-foot span between the towers, or when a creature manipulates either tower or its conduits. Creatures that are aware of the hazard can avoid triggering it by remaining outside that span.
Disable: Two successful Arcana, Crafting, or Thievery checks disable one siphon's control collar. A critical success counts as two successes. Each siphon must be disabled separately. A critical failure on a check triggers that siphon immediately against the creature attempting the check.
Initiative: +26
Routine: On its turn, each active siphon uses Siphon Drag against one creature within 60 feet. Then, if both siphons remain active, the siphon that did not use Siphon Drag uses Crosscurrent Lash against a different creature within 60 feet. A siphon cannot target a creature behind total cover. If only one siphon remains active, it uses Siphon Drag once.
Reset: The hazard resets automatically at the start of each round while at least one siphon remains active. A disabled siphon stays disabled until repaired. Destroyed siphons cannot reset.

Damage

Immunities

critical hits, object immunities, precision

Resistances

physical 10, except adamantine

Weaknesses

electricity 10

Effects

2

Siphon Drag
DC 34
The targeted creature takes bludgeoning damage and must attempt a Fortitude save. Critical Success: No additional effect. Success: The creature is pulled 5 feet toward the siphon. Failure: The creature is pulled 15 feet toward the siphon and knocked prone. Critical Failure: The creature is pulled 20 feet toward the siphon, knocked prone, and restrained until the end of its next turn.
Crosscurrent Lash
DC 34
The other siphon targets a creature within 60 feet of it. The creature takes force damage, with a basic Reflex save. On a failed save, the creature is also pushed 10 feet away from the siphon. This effect does not occur if the other siphon has been disabled or destroyed.

Special rules

Paired Mechanisms.The two towers are separate objects but form one complex hazard. Each has AC 34, Hardness 18, and 80 HP, with BT 40. Disabling or destroying one does not damage the other.

Broken Circuit.If one siphon is disabled or destroyed, the remaining siphon takes a -2 circumstance penalty to its attack modifier and its effects' DCs. If both are disabled or destroyed, the hazard is permanently inactive.

Spotting it

Discovery

A creature that Searches the machinery or examines the central causeway can attempt a Perception check to notice that the floor grates conceal paired conduits and that the two towers react to movement in the open.

Perception

+26

Stop it

Signs of dangerWater and loose debris creep uphill toward the towers, then abruptly reverse direction. · The floor grates hum in alternating pulses, one low and one high. · A creature standing near a conduit feels its belt, weapons, or armor tug toward the nearest tower.

Countermeasures

A creature adjacent to a siphon can use an Interact action to wedge its throat with a sturdy object. The siphon cannot use its action on its next turn, but the object is destroyed when the siphon resumes.
DC 36A creature can use Arcana or Crafting to disable a control collar from an adjacent space. Two successful checks disable one siphon; a critical success counts as two successes. A critical failure triggers that siphon immediately.
A creature can use Thievery to disable a siphon's exposed valve with the same DC and success track.
Dealing 80 damage to a siphon destroys it. The siphons have Hardness 18 and BT 40. Destroying one permanently disables its own action and lowers the other siphon's attack and save DCs by 2.
A successful dispel magic against a siphon, using a counteract rank of 7 or higher, suppresses it for 1 round on a success or 1 minute on a critical success.

In short

Break the linked circuit by disabling both control collars, interrupting a siphon with a well-timed spell or physical obstruction, or destroying the machinery.

Its story

What it looks like

Two bronze-black siphon towers rise from opposite ends of the battlefield, each crowned by a rotating glass throat.

Why it is here

To control a contested battlefield by dragging intruders off defensible ground and punishing clustered or predictable movement.

Who made it

The engineer-priest Veyra Kest, who designed the device to keep a siege engine powered by draining intruders and feeding the stolen force back into its twin.

Lore

Crafting or Occultism identifies the towers as paired force reservoirs that redirect kinetic energy through a shared circuit.

Where it is found

A fortified industrial chamber, dam control room, or broad battlefield crossed by exposed conduits and grates.

Variants

Flooded Siphons: Replace the force lash with a surge of water. Creatures in a 15-foot cone take 4d10 bludgeoning damage with a DC 34 basic Reflex save, and failed saves push them 10 feet.

Grave Siphons: The towers drain vitality instead of momentum. Siphon Drag deals negative damage instead of bludgeoning damage, and its critical failure also makes the target drained 1 for 1 minute.

Unstable Pair: At the end of each round, roll 1d6. On a 1, one siphon sputters and cannot act on its next turn; on a 6, both target the same creature with their next available effects.

Plot hooks

The siphons are draining power from a sealed vault beneath the battlefield, and the party must decide whether to disable them or risk releasing what they contain.

A besieging force is holding the siphon chamber while allied engineers attempt to reverse the flow from a nearby control station.

One tower has begun drawing from a living creature trapped in the machinery, and every activation makes its distant voice clearer.

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