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Veil-Stalker Spider - AI-generated fantasy Monster

Veil-Stalker Spider

Sages refer to these creatures as 'Glitches.' While a mature Phase Spider is a precise assassin, the Veil-Stalker is a chaotic blur. They are often expelled from the main colony until they can control their phasing, leading them to hunt humanoid paths in desperation.

Monsters
Medium monstrosity · Medium · Uncommon

Veil-Stalker Spider

A juvenile Phase Spider suffering from 'planar instability,' causing it to rapidly flicker between the Material and Ethereal planes like a broken strobe light.
AC13
HP32/32
CRMedium
Init
STR
DEX
CON
INT
WIS
CHA
ConditionsNone

Combat

AC 13 · HP 32 · Medium

Veil-Stalker Spider

Medium monstrosity (interdimensional), unaligned
Armor Class13
Hit Points32 (5d8 + 10)
Speed
30 ft.,
Climb 30 ft.
STR
DEX
CON
INT
WIS
CHA
Saving ThrowsDexterity
SkillsStealthPerception
Damage Resistances
None
Immunities
None
Weaknesses
Force damage (disrupts flickering)
Senses
Darkvision 60 ft.,
Passive Perception 13
Languages
None
ChallengeMedium
Strobe Phasing. The spider flickers in and out of existence. Attack rolls against the spider have disadvantage. If it is hit by an attack, this trait is suppressed until the start of its next turn. This trait does not function if the spider is incapacitated or in an area of antimagic.
Spider Climb. The spider can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
Web Walker. The spider ignores movement restrictions caused by webbing.

Actions

Venomous Bite. Melee Weapon Attack: to hit, reach 5 ft., one creature. Hit: 7 () piercing damage, and the target must make a Constitution saving throw, taking 9 () poison damage on a failed save, or half as much damage on a successful one.
Veil Leap. The spider magically teleports up to 30 feet to an unoccupied space it can see. Immediately after it teleports, it can make one Venomous Bite attack with advantage.

Reactions

Flicker Shield. When the spider is targeted by a ranged attack, it can use its reaction to fully phase out. It gains a bonus to AC against that attack. If the attack misses, the spider teleports 10 feet.
Role
Skirmisher
Built for
Level 2 to 3

Feats

Mobile

Augmentations

None

Notes for the game master

The strobe effect is visual; characters with blindsight or truesight ignore the disadvantage from Strobe Phasing.
Force damage is particularly effective as it interacts with Ethereal matter.

Tactics

  1. Opening

    Uses Veil Leap from the forest canopy to target the smallest looking humanoid, attempting to paralyze them with poison quickly.

  2. Mid-fight

    Focuses on 'hit and run' tactics. It uses its climb speed to stay out of reach, dropping down for a bite and using its bonus movement to climb back up.

  3. End of the fight

    If reduced below 10 HP, the spider becomes truly desperate and aggressive, ignoring its own safety to secure a kill.

  4. Retreat

    If it fails to kill a target within 4 rounds, or if the party uses See Invisibility/Faerie Fire, it will attempt to flee into the Ethereal Plane (though it might fail and just teleport away).

How it fights

Uses flickering to stay safe from Opportunity Attacks.
Targets casters who lack heavy armor to ensure its Bite hits.
Will use Flicker Shield against the first arrow or spell bolt fired at it.

Who it attacks first

Isolated characters
Characters without shields
Wounded prey

Works well with

Paired with a Phase Spider Matriarch who watches from the Ethereal plane.
Environmental hazards like Faerzress or Wild Magic zones that intensify the strobe effect.

How to beat it

Faerie Fire (prevents flickering benefits)
Magic Missile (guaranteed hits bypass disadvantage)
Sentinel feat (prevents the spider from escaping back to the trees)

Ways to avoid a fight

If offered high-protein food or a magical item with planar energy, the spider may be bribed into leaving.
An Arcana check (DC 15) allows a player to realize the creature is in pain from its unstable state, allowing for a calming Animal Handling check.

Ecology

A Medium spider with a translucent, obsidian-like exoskeleton. Its eight eyes glow with a sickly violet hue. It does not move smoothly; instead, its form jitters and tears at the edges, frequently vanishing for a microsecond only to reappear a few inches away, accompanied by a faint crackling sound.

Behavior

Aggressive and jittery. It hunts with frantic energy, driven by a juvenile hunger and a biological urge to stabilize its shifting form through the consumption of 'anchored' Material Plane blood.

How it lives

As a juvenile Phase Spider, it has not yet mastered the Ethereal Jaunt. This 'veil-strobe' is a developmental phase. It must eat twice its body weight to fuel the energy required for its involuntary shifting.

Lair

Does not maintain a traditional lair, but prefers thick forest canopies where the shadows help hide its flickering form.

Habitat
Deep forests, areas where the barrier between planes is thin, or ruins near Ethereal rifts.

Signs that it is near

Half-eaten prey that looks partially translucent
Faint violet static clinging to low-hanging branches
The sound of rapid, rhythmic clicking and humming
Silver webbing that feels cold and tingles to the touch

Tags

Spider,
Planar,
Predator

Lore

Sages refer to these creatures as 'Glitches.' While a mature Phase Spider is a precise assassin, the Veil-Stalker is a chaotic blur. They are often expelled from the main colony until they can control their phasing, leading them to hunt humanoid paths in desperation.

What drives it

To prove itself as a viable hunter and bring a substantial kill back to its brood's Matriarch.

After the fight

Once slain, the spider's body remains on the Material plane, but its violet eyes continue to flicker for 1d4 hours before going dim.

Variants

Charged Veil-Stalker: Deals 1d4 lightning damage to anyone touching it due to planar friction.

Hooks

Plot hooks

A local woodsman describes 'ghost spiders' that kill cattle and vanish before the axe falls.
A researcher needs a sample of 'stabilized violet venom' from a juvenile spider.
The party finds a village where the children claim a monster 'blinks' in their bedrooms at night.

How to use it

A roadside ambush in a haunted wood.
A guardian of a planar rift.
A 'failed' pet belonging to a more powerful wizard.

Treasure

Phasing Venom (2 doses): Can be applied to a weapon; targets hit must save vs DC 11 or be outlined in violet light for 1 minute.
Obsidian Carapace Fragments: Worth 50gp to a specialized armorer.

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