Fiend Folio: Spiderwere for Dungeons & Dragons 5th Edition

Ordinary spiders tainted by demonic power, spiderweres hunt dark places like alleys, forests, and caves. They keep their territory free of threats.

A spiderwere has two physical forms that it shifts between. In its true form, it is indistinguishable from a medium-sized spider. It can take human form, often being highly aware and very social. 

Spiderwere
medium shapechanger, chaotic evil
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Armor Class 16 (natural armor)
Hit Points 45 (7d10 + 7) 

Speed 30 ft., climb 30 ft.
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   Str                  Dex                Con           
16 (+3)       17 (+3)         13 (+1)  
   Int                  Wis                Cha
13 (+1)         12 (+1)          12 (+1)

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Skills Deception +3, Perception +3, Stealth +7
Damage Immunities Bludgeoning, Piercing, and Slashing from Nonmagical Attacks that aren't Silvered

Senses Blindsight 10 ft., Darkvision 60 ft., passive 
Perception 12

Languages Common (can't speak in spider form)
Challenge 2 (450 XP)

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Shapechanger. The spiderwere can use its action to polymorph into a specific Medium human or back into its true form (that of a Medium spider). Other than its size, its statistics are the same in each form. Any equipment it is wearing or carrying isn’t transformed. It reverts to its true form if it dies.

Spider Climb. The spiderwere can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Web Sense. While in contact with a web, the spiderwere knows the exact location of any other creature in contact with the same web.

Web Walker. The spiderwere ignores movement restrictions caused by webbing.

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ACTIONS

Short Sword (Human Form Only). Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) slashing damage.

Bite (Spider Form Only). Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. 

Hit: 12 (2d8 + 3) piercing damage, and the target must make a DC 13 Constitution saving throw, taking 9 (2d8) poison damage on a failed save, or half as much damage on a successful one. If the poison damage reduces the target to 0 hit points, the target is stable but poisoned for 1 hour, even after regaining hit points, and is paralyzed while poisoned in this way.

Web (Recharge 5–6) (Spider Form Only). Ranged Weapon Attack: +6 to hit, range 30/60 ft., one creature. Hit: The target is restrained by webbing. As an action, the restrained target can make a DC 14 Strength check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 10; hp 10; vulnerability to fire damage; immunity to bludgeoning, poison, and psychic damage).

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