Acromantula

Large beast, unaligned

Armor Class 

14 (natural armor)

Hit Points 

26 (4dl0 + 4)

Speed 

30 ft., climb 30 ft.

STR	DEX	CON	INT	WIS	CHA
14 (+2)	16 (+3)	12 (+1)	2 (-4)	11 (+0)	4 (-3)

Skills 

Stealth +7

Senses 

blindsight 10 ft., darkvision 60 ft., passive Perception 10

Languages 

—

Challenge 

1 (200 XP)

Spider Climb 

The spider 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 spider knows the exact location of any other creature in contact with the same web.

Web Walker 

The spider ignores movement restrictions caused by webbing.

Actions

Bite 

Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 7 (ld8 + 3) piercing damage, and the target must make a DC 11 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). Ranged Weapon Attack: +5 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 12 Strength check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 10; hp 5; vulnerability to fire damage; immunity to bludgeoning, poison, and psychic damage).

To snare its prey, a giant spider spins elaborate webs or shoots sticky strands of webbing from its abdomen.

Habitat 

Giant spiders are most commonly found underground, making their lairs on ceilings or in dark, web-filled crevices. Such lairs are often festooned with web cocoons holding past victims.

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Potterverse Description

Monstrous eight-eyed, hairy spiders capable of Common human speech. Carthorse-sized and carnivorous, they have eight legs and sharp pincers. When excited or angry, they make a distinctive clicking sound and secrete poison. They fear Basilisks.[1]