◆ World Build
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Image promptmedium aberrant spider-humanoid, too-long jointed limbs, swollen web-spinning abdomen, cluster of dark eyes, clinging upside-down beneath city eave, skittering across alley walls, web-choked narrow street, oily black chitin, pallid grey webbing across frame, flicker of orange flame nearby as weakness, grimy urban greys, predatory lurking pose, dark fantasy, grimdark, painterly digital art, dramatic chiaroscuro lighting, muted desaturated palette with corrupted-crimson accents, weathered post-Cataclysm atmosphere, intricate high detail, cinematic composition

Alley Weaver

Medium Aberration, Neutral Evil
CR 6ControllerSettlement / Road
AC 15
STR
13
+1
save +1
DEX
18
+4
save +7
CON
20
+5
save +5
INT
16
+3
save +6
WIS
15
+2
save +2
CHA
12
+1
save +1
Skills Perception +5, Stealth +7
Resistances Psychic · Immunities Charmed, Frightened
Senses Darkvision 120 ft.; Passive Perception 15 · Languages Deep Speech, Common

Traits

Urban Web. The Alley Weaver spins webs on urban terrain (street, rooftop, building). The ground within 20 feet becomes Difficult Terrain at its discretion. Spider Climb. Moves freely on walls/ceilings.

Actions

Multiattack. One Web Snare and two Bite attacks. Bite. Melee Attack Roll: +7, reach 5 ft. Hit: 12 (2d6 + 4) Piercing plus 7 (2d6) Poison. Web Snare. Ranged Attack Roll: +7, range 60 ft. Hit: The target has the Restrained condition (web; escape DC 15, Strength check). The web has AC 10, HP 15 and has Vulnerability to Fire damage. Constricting Alley (Recharge 5–6). The Alley Weaver covers a street/corridor with webs. A 30-foot × 10-foot area within 60 feet. Every creature in that area makes a DC 15 DEX save. Failure: 27 (6d8) Poison damage and the Restrained condition (escape DC 15). Success: Half. The web lasts 1 minute; the area is Difficult Terrain.

Key

Fire (webs are Vulnerable) and open plazas (Urban Web works in a street, not an open square).