Clockwork Weaving Spider

Tiny construct, unaligned

Armor Class 15 (natural armor)
Hit Points 30 (12d4)
Speed 40 ft., climb 40 ft.

10 (+0) 16 (+3) 10 (+0) 9 (-1) 8 (-1) 8 (-1)

Skills Acrobatics +5, Perception +3
Damage Immunities poison, psychic
Condition Immunities blinded, charmed, deafened, exhaustion, frightened, paralyzed, petrified, poisoned
Senses darkvision 60 ft., passive Perception 13
Languages understands Common but can’t speak
Challenge 1 (200 XP)
Proficiency Bonus +2


  • Construct Nature. The clockwork weaving spider doesn’t require air, food, drink, or sleep.
  • Immutable Form. The clockwork weaving spider is immune to any spell or effect that would alter its form.
  • Magic Resistance. The clockwork weaving spider has advantage on saving throws against spells and other magical effects.
  • Unmaking. The clockwork weaving spider’s speed and its slim, sharp blade can slice cloth, leather, and paper into scraps very quickly. Whenever a weaving spider’s Trimming Blade attack roll exceeds the target’s Armor Class by 5 or more, the target must succeed on a DC 13 Dexterity saving throw or one nonmagical cloth, leather, or paper object on the target becomes damaged and unusable until repaired. This effect can deface or ruin clothing, backpacks, journals, and similar objects, but it can’t destroy armor.


  • Multiattack. The clockwork weaving spider makes two Trimming Blade attacks or two Poisoned Needle Shuttle attacks.
  • Trimming Blade. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 8 (2d4 + 3) slashing damage.
  • Poisoned Needle Shuttle. Ranged Weapon Attack: +5 to hit, range 30 ft., one target. Hit: 7 (1d8 + 3) piercing damage, and the target must succeed on a DC 13 Constitution saving throw or become paralyzed for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.


This mechanical spider has long, spindly legs, including one equipped with a sharp blade that’s disproportionately large for the creature’s body.

Cloth Makers. These tiny, useful devices are a boon to weavers as they help produce clothing. They also sometimes serve as spies and defenders, for nothing is so invisible as a simple machine making cloth, day in and day out. As their name implies, these devices resemble large spiders but with ten limbs instead of eight. Two of their legs are equipped with loops or crooks useful in guiding thread on a loom, six are for moving and climbing, one is for stitching and extremely fast needlework, and one has a razor-sharp blade used to trim thread or cloth (or for attacking foes).

Throw Poison. Weaving spiders rarely initiate combat unless directed to by their owners, but they instinctively defend themselves, their masters, and other weavers. A weaving spider throws its poisoned shuttle at the nearest foe, then climbs along the strand to attack that foe. Weaving spiders fight until destroyed or ordered to stand down. When spying, they flee as soon as they are threatened, to preserve whatever information they have gathered.

Section 15: Copyright Notice

Tome of Beasts 1 ©2023 Open Design LLC; Authors: Daniel Kahn, Jeff Lee, and Mike Welham.

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