Here is a d100 random encounter table for traps, hazards, and magical snares designed for planar travel, divine realms, lower planes, and ethereal reaches.
d100 Planar Traps and Snares
| d100 | Trap / Snare Name | Visual & Triggers | Effect & Mechanics |
| 01–03 | Chronal Loop Trap | Fractured, glass-like air; triggered by crossing an astral boundary. | Victims repeat their previous turn’s actions endlessly until targeted by dispell magic or dispel evil and good. |
| 04–06 | Astral Thread Entangler | Silvery, nearly invisible monofilament webs suspended in void. | Entangles non-ethereal creatures. Severing requires a slash weapon; failure risks severing an Astral Projection cord. |
| 07–09 | Gravity Anchor | Rune-carved obsidian sphere floating in place; triggered by proximity. | Inverts or intensifies gravity locally (10x strength), slamming creatures into ceiling or pulling them into the abyss. |
| 10–12 | Hellfire Pressure Plate | Inscribed brimstone glyphs; triggered by weight or non-fiend footsteps. | Blasts a 20-ft radius with unholy hellfire; deals half Fire damage and half Necrotic/Unholy damage. |
| 13–15 | Memory-Drain Vortex | Swirling indigo fog emitting faint whispers; triggered by passing through. | Pulls targets in and drains 1d4 character levels or spell slots, granting the vortex temporary planar hit points. |
| 16–18 | Phase-Shift Cage | Shimmering violet grid across a doorway; triggered by motion. | Traps victims in an interdimensional pocket between the Material and Ethereal Planes until deactivated. |
| 19–21 | Abyssal Spite Glyph | Jagged crimson sigil hidden on an archway; triggered by Divine magic. | Summons 1d4 dretches/demonic imps while casting a Blight effect centered on the caster. |
| 22–24 | Brimstone Mire Trap | Appears as normal mud/dirt; triggered by stepping onto the surface. | Acts as sinking quicksand superheated with molten sulfur; causes fire damage per turn while suffocating. |
| 25–27 | Celestial Mirror Snare | Polished white marble wall; triggered by looking at one's reflection. | Forces a Charisma saving throw; failure traps the soul inside the mirror while an evil duplicate steps out. |
| 28–30 | Shadowfell Despair Pit | Pit concealed by illusions of solid ground; bottom is pure shadow energy. | Fall deals impact damage plus continuous Necrotic damage and instills extreme apathy (disadvantage on all checks). |
| 31–33 | Planar Drift Wire | Thin wire made of condensed raw Chaos; triggered by breaking the wire. | Teleports the target to a random locations on a completely different plane of existence. |
| 34–36 | Screaming Soul Doorway | Door frame sculpted with agonized faces; triggered by opening without key. | Unleashes a 60-ft cone Banshee Wail sound wave, forcing Constitution saves vs. immediate drop to 0 HP or stunned. |
| 37–39 | Ethereal Anchor Mine | Floating translucent orb; triggered by crossing into the Ethereal Plane. | Explodes across planes, force-shoving ethereal entities into solid material walls (causing massive force damage). |
| 40–42 | Void-Touch Pressure Lock | Pedestal requiring a hand touch; pressure-activated without protective wards. | Freezes the toucher's hand with outer-space cold, dealing Cold/Force damage and temporarily petrifying the limb. |
| 43–45 | Axiomatic Prism Net | Golden geometric web hanging from high ceilings; drops on chaotic aligned creatures. | Restrains and inflicts continuous Radiant damage; chaotic entities take double damage. |
| 46–48 | Temporal Stasis Bubble | Suspended dust particles frozen in mid-air; triggered by entry into the zone. | Suspends target in absolute time stasis; time inside stops until an outside catalyst disrupts the perimeter. |
| 49–51 | Arcane Resonance Tripwire | Mana-reactive wire; triggered by casting spells near the wire. | Absorbs the spell energy and redirects it back at the caster amplified by 200%. |
| 52–54 | Phantasmal Dread Web | Shadowy cobwebs lining narrow passages; triggered by touch or fire exposure. | Triggers intense horror visions; victims must save vs. Wisdom or be frightened and attack random allies. |
| 55–57 | Negative Energy Well | Dark, gravity-well sinkhole in space/ground; pulls nearby objects. | Sucks targets toward center, dealing Necrotic damage and reducing maximum hit points on contact. |
| 58–60 | Negative Mass Trap | Runed sigil on floor; triggered by standing directly over it. | Flips physical mass to negative value; target floats uncontrollably into upper planar hazards/ceilings. |
| 61–63 | Chaos Blast Geyser | Fissure glowing with shifting rainbow hues; triggers on a random interval. | Shoots a column of raw Limbo-energy; Roll d6 to determine elemental damage type (Fire, Cold, Acid, Lightning, Force, Radiant). |
| 64–66 | Ethereal Phase-Bait | Illusory treasure floating in the air; triggered when grabbed. | Pulls the target's physical body half into the Border Ethereal, causing severe interplanar shearing damage. |
| 67–69 | Infernal Binding Chains | Spiked chains resting on the floor; triggered by proximity to fiend-seals. | Chains spring up, wrap around the intruder, and pull them down toward an active portal to the Nine Hells. |
| 70–72 | Mind-Shatter Crystal Array | Clusters of glowing purple crystals along walls; triggered by loud sounds. | Resonates at a psychic frequency, dealing Psychic damage and inflicting temporary madness/confusion. |
| 73–75 | Null-Magic Pit Trap | Camouflaged pit trap filled with anti-magic residue. | Nullifies all active magic, spell slots, and magic items while trapped inside; falling damage is physical force. |
| 76–78 | Astral Wind Funnel | Narrow corridor with high planar pressure; triggered by crossing midpoint. | Generates a sudden gale-force Astral Wind, blowing travelers miles off-course or severing astral cords. |
| 79–81 | Soul-Lock Sigil | Inscribed floor circle; triggered when stepped upon by living beings. | Binds the soul to the location; target cannot move more than 30 feet from the sigil until Remove Curse is cast. |
| 82–84 | Elemental Magma Geyser | Red-hot fissures connected to the Elemental Plane of Fire; pressure plate trigger. | Erupts a 30-ft blast of lava, dealing Fire and Bludgeoning damage, setting the room ablaze. |
| 85–87 | Shadow-Steal Trap | Unnaturally sharp shadows cast on walls; triggered by passing light sources. | Detaches the victim's shadow; shadow turns into a hostile Shadow/Undead creature that attacks its owner. |
| 88–90 | Singularity Trap | Tiny floating black marble; triggered by disturbing the surrounding air. | Expands into a miniature black hole for 2 rounds, dragging all nearby objects and creatures inward to crush them. |
| 91–93 | Githyanki Silver-Blade Snare | Monofilament blade suspended in an astral current; tripwire trigger. | Specifically targets astral projections; high chance of slicing silver cords or dealing severe slashing damage. |
| 94–96 | Fey-Bramble Tangle | Overgrown thorns imbued with Feywild energy; triggered by physical contact. | Entangles target, inflicting Piercing damage and charming them with euphoric hallucinations (Sleep / Suggestion effect). |
| 97–98 | Blood-Ritual Altar Snare | Ancient altar dripping blood; triggered by blood spilling in the room. | Animates floor tiles into a gripping hand while draining 2d10 HP per round to power an unseen summoning ritual. |
| 99–00 | Cosmic Collapse Glyph | Primordial sigil carved in ancient celestial/abyssal script; triggered by failing to decipher. | Collapses local spatial dimensions into a 0D point, crushing everything within 40 feet into planar dust. |
Here are the mechanics, checks, disarm methods, and challenge level (CL) scaling converted for the Castles & Crusades system (Siege Engine).
In C&C, saving throws and attribute checks use the SIEGE Engine:
All rolls are $d20 + \text{Attribute Modifier} + \text{Level/HD}$.
#01: Chronal Loop Trap
A patch of fractured, glass-like air hanging suspended in time, reflecting echoes of events that haven't occurred yet.
Trigger: Crossing an astral or planar boundary into the affected 10 ft. space.
Detection & Identification:
Wisdom / Intelligence Check (CL 3): Spotting the optical refraction and time-lag in ambient air currents. Rogue Find Traps check applies.
Effect & Mechanics:
Upon triggering, the victim is snapped back to the exact physical position and mental state they occupied at the start of their previous round. They are forced to repeat the exact same actions, movement, spellcasting, or attacks made on that turn.
At the start of each subsequent turn, the victim must pass a Wisdom Save (CL 3) to break the loop and regain free agency.
On a failed save, they repeat their previous turn again, expending spell slots, charges, or arrows as appropriate.
Disarm & Countermeasures:
Dispel Magic: Cast against a base CL 5 automatically dissolves the temporal distortion.
Temporal Interference: Casting Haste, Slow, or Counterspell on the boundary disrupts the trap matrix for 1d6 turns.
Physical Bypass: Spells like Dimensional Anchor or spatial movement (Teleport) bypass the zone completely without triggering the loop.
Damage Scaling & Severity by Challenge Level (CL):
CL 1–4 (Low Tier): The chronal strain inflicts 2d8 points of damage (Wisdom Save halves) at the end of each repeated turn.
CL 5–9 (Mid Tier): Deals 4d10 points of damage per repeated turn. Failing the save by 5 or more drains 1 point of Constitution temporarily (restored after a full rest).
CL 10+ (High Tier): Deals 8d10 points of damage per repeated turn. Failing the save by 5 or more inflicts 1 level of permanent Energy Drain / Level Drain.
#13: Memory-Drain Vortex
A swirling vortex of thick, indigo fog that emits faint, whispering echoes of lost thoughts and stolen names.
Trigger: Moving within 15 feet of the vortex without an active warding spell (Mind Blank, Nondetection).
Detection & Identification:
Wisdom / Intelligence Check (CL 2): Hearing the faint, mournful whispering in the air before entering the area.
Rogue Traps Check (CL 4): Identifying the psychic haze and its epicenter.
Effect & Mechanics:
When triggered, the vortex exerts a powerful gravitational and psychic pull within a 20-foot radius.
All caught in range must pass a Strength Save against the vortex's CL or be dragged directly into the core.
Any creature starting its turn inside the mist must pass an Intelligence Save against the vortex's CL. On a failure, the vortex drains spell slots or class abilities, absorbing the mental energy to bolster its own physical form.
Disarm & Countermeasures:
Dispel Magic / Remove Curse: Requires an Prime check or caster check vs. the trap’s CL to break the vortex matrix.
Memory Substitution: Sacrificing a high-value spell scroll or written ledger of intense personal memories directly into the vortex overloads its core, causing it to collapse.
Wind Effects: Powerful wind spells (Gust of Wind) suppress the hazard for 1d4 rounds.
Scaling by Challenge Level (CL):
CL 2 (Levels 1–4):
Saves: STR Save (CL 2) | INT Save (CL 2)
Resource Drain: Drains 1st-level spell slots or lowest available daily ability.
Damage & Vigor: Deals 2d6 Psychic damage per turn. The vortex gains 10 temporary Hit Points per drained spell level.
CL 5 (Levels 5–8):
Saves: STR Save (CL 5) | INT Save (CL 5)
Resource Drain: Drains up to 3rd-level spell slots or 1 major class use (e.g., Turn Undead attempt, Smite).
Damage & Vigor: Deals 4d6 Psychic damage per turn. Vortex gains 20 temporary Hit Points per drained level.
CL 9 (Levels 9–12):
Saves: STR Save (CL 9) | INT Save (CL 9)
Resource Drain: Drains up to 5th-level spell slots.
Damage & Vigor: Deals 8d6 Psychic damage per turn. Vortex gains 40 temporary Hit Points per drained level.
CL 13+ (Levels 13+):
Saves: STR Save (CL 13) | INT Save (CL 13)
Resource Drain: Drains up to 7th-level spell slots. If the target has no spell slots left, it drains 1d2 points of Intelligence permanently (requires Heal or Restoration).
Damage & Vigor: Deals 12d6 Psychic damage per turn. Vortex gains 60 temporary Hit Points per drained level.
#88: Singularity Trap
A dense, pitch-black marble hovering silently in mid-air, bending light around its hyper-compressed core.
Trigger: Physical, kinetic, or vocal movement within 5 feet (walking past, firing a missile, or vocalizing spell casting components).
Detection & Identification:
Intelligence / Arcana Check (CL 5): Recognizing the gravitational distortion as an uncontained planar micro-singularity.
Wisdom Check (CL 2): Spotting dust and light bending toward a floating dark sphere.
Effect & Mechanics:
Upon activation, the marble collapses in on itself and expands into a 30-foot-radius sphere of absolute gravitational crushing force for 2 rounds before dissipating into the void.
The affected area acts as impassable / double-cost movement terrain.
Any creature within range at the start of its turn must make a Strength Save against the trap's CL. On a failure, it is dragged straight to the center point.
Creatures that end their turn within the inner core take severe crushing Force damage and are pinned/helpless against the event horizon.
Disarm & Countermeasures:
Dimensional Neutralization: Casting Banishment, Plane Shift, or Dimensional Anchor directly on the sphere routes the gravitational force into another plane safely.
Force Barriers: Casting Prismatic Wall or Globe of Invulnerability around the sphere completely dampens the pull.
Rogue Disarm: A Rogue attempting a Dismantle/Disable Trap check (CL 6) using specialized lead or adamantine tools can safely encase the marble without triggering it.
Damage Scaling by Challenge Level (CL):
CL 3 (Levels 1–4):
Saves: STR Save (CL 3) | Radius: 15 ft. core / 30 ft. pull range
Damage: 4d10 Force damage per round spent in the core.
CL 6 (Levels 5–8):
Saves: STR Save (CL 6) | Radius: 20 ft. core / 40 ft. pull range
Damage: 8d10 Force damage per round.
CL 10 (Levels 9–12):
Saves: STR Save (CL 10) | Radius: 30 ft. core / 60 ft. pull range
Damage: 14d10 Force damage per round. Non-magical equipment caught in the core is crushed to dust.
CL 14+ (Levels 13+):
Saves: STR Save (CL 14) | Radius: 40 ft. core / 80 ft. pull range
Damage: 20d10 Force damage per round. Creatures reduced to 0 hit points by this damage are instantly crushed into non-existence (requires Resurrection or Wish to restore).
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