Leng Spider

Leng Spider CR 12

This bloated, mottled purple spider’s eyes shine eerily as if resenting the fact that you are still alive. Its head swivels to examine the area as a twinge of regret washes over you.

XP 19,200
LE Large magical beast (extraplanar)
Init +7; Senses darkvision 60 ft., low-light vision, tremorsense 30 ft.; Perception +20


AC 27, touch 17, flat-footed 19 (+7 Dex, +1 dodge, +10 natural, –1 size)
hp 162 (13d10+91)
Fort +15, Ref +15, Will +10
Immune cold, poison; SR 23


Speed 40 ft., climb 40 ft.
Melee bite +18 (2d6+6/19–20 plus poison and perpetual pain), 4 talons +18 (1d6+6)
Space 10 ft.; Reach 10 ft.
Special Attacks perpetual pain, traps, poison, toxic webs (+19 ranged, DC 25, 26 hp)


Str 22, Dex 24, Con 25, Int 19, Wis 18, Cha 19
Base Atk +13; CMB +20; CMD 38
Feats Combat Expertise, Combat Reflexes, Dodge, Improved Critical (bite), Iron Will, Mobility, Spring Attack
Skills Climb +30, Craft (traps) +17, Disable Device +20, Perception +20, Sense Motive +17, Stealth +19 (+27 in webs); Racial Modifiers +8 Stealth in webs
Languages Aklo, Common, Leng Spider
SQ strong webs, toxic webs


Perpetual Pain (Su)

When a leng spider envenoms a creature with its bite attack (but not when a creature becomes poisoned from its webs), the pain caused by the poison lingers. A victim poisoned by a leng spider’s bite becomes permanently sickened from the pain of this lingering venom, though a successful DC 23 Fortitude save reduces the duration of this sickened condition to 24 hours. This is a poison and a curse effect, and any effect that removes poison or curse will end the sickened condition. The save DC is Constitution-based.

Poison (Ex)

Bite—injury; save Fort DC 23; frequency 1/round for 6 rounds; effect 1d4 Str; cure 2 consecutive saves.

Strong Webs (Ex)

A leng spider’s webs are unusually strong. The DC to break them gains a +2 racial bonus, and the web’s hit points are twice their normal, expected value. These modifications are already calculated into the stats above.

Toxic Webs (Ex)

A creature that comes into contact with a leng spider’s web is exposed to a diluted form of the toxin in the leng spider’s bite. This poison works differently than normal poison does. When a creature touches a leng spider web, it must make a successful DC 23 Fortitude save or it becomes weakened by pain, suffering a –6 penalty to its Strength score as long as it remains in contact with the webs and for an additional 1d6 rounds after contact ceases. A new save is required at the start of each round of contact, but the Strength penalty from multiple exposures does not stack. The save DC is Constitution-based.

Traps (Ex)

Leng spiders are particularly gifted at crafting complex traps using their webs and other objects at hand. Often these traps utilize bait in the form of wounded captives or attractive treasure. Creating a trap takes a leng spider a number of hours equal to the final CR of the trap. The trap created must be mechanical (not supernatural) in nature, and often utilizes leng spider webbing in some way or another. Leng spider traps must be frequently tended and often need minor repairs, and as such, a single leng spider can only maintain a total number of traps at a time whose combined CRs add up to a number equal to or less than the leng spider’s CR. For example, a single CR 12 leng spider can maintain 1 CR 12 trap at a time, 2 CR 6 traps, a dozen CR 1 traps, three CR 2 traps and a single CR 6 trap, and so on. All of these traps must be located within 1 mile of each other. Leng spiders prefer traps that catch and incapacitate rather than kill.

Three typical leng spider traps are presented below.

Boulder-Capped Pit (CR 8): Type mechanical; Notice Perception DC 25; Disarm Disable Device DC 28; Trigger touch; Reset manual; Effect When the trigger (usually a piece of treasure) is touched, a five-foot-wide, 20-foot deep pit opens. The creature can avoid falling with a successful DC 20 Reflex save, but if it fails it takes only 1d6 falling damage as the toxic webs that line the pit’s floor soften the impact slightly. As the pit’s floor and walls are web-coated, creatures in contact with them must save against the toxic webbing as detailed above. A round or two after the pit opens, a large boulder drops down from above to close the pit off, trapping the victim inside. This six-foot-diameter boulder (hardness 8, hp 1,080) weighs ten tons, so moving it from below by force is essentially impossible. A leng spider can use its webs as cables to roll the boulder aside as a full-round action; at the GM’s discretion, cunning PCs might be able to do the same given the right resources and plan.

Boulder Pendulum (CR 12); Type mechanical; Notice Perception DC 28; Disarm Disable Device DC 28; Trigger location; Reset manual; Effect This deadly trap is an example of an exception to the leng spider’s preference for non-lethal traps. A boulder pendulum is typically placed in an area of narrow confines, such as along a mountain ledge or in a narrow passage with a tall ceiling. When triggered, a large boulder swings down on a thick cord of webbing. It makes a +20 melee attack on the creature that triggered the trap and against all creatures in a 30-foot line beyond the initial target. On a hit, the boulder inflicts 8d6 points of bludgeoning damage. A creature damaged by this trap must make a DC 20 Reflex save to avoid being knocked prone. If a creature is knocked prone while on a ledge that is no wider than the creature’s space, it has a 50% chance of being knocked off the ledge.

Web Net (CR 3); Type mechanical; Notice Perception DC 20; Disarm Disable Device DC 20; Trigger location; Reset manual; Effect When a creature enters the trapped location, the trap triggers, causing a weighted net made of toxic leng spider webbing to drop over a ten-foot-diameter area below. A creature can attempt a DC 15 Reflex save to dodge out of the net’s way—otherwise the creature is knocked prone, entangled, and exposed to the web’s toxins (see above).


Environment cold mountains
Organization solitary, pair, or nest (3–12)
Treasure standard

Leng spiders are intelligent, carnivorous spiders. An adult has a legspan of 20–30 feet or occasionally more, but smaller (younger) specimens are common. An adult weighs 1-3 tons. Since they never stop growing, a few are far larger.

Leng spiders are sly and design traps for their prey.

These can be elaborate and often involve treasure as bait. They are clever enough to let some adventurers live after finding the treasure, to entice further visitors to their mountain lairs. They delight in preying on humanoid egos and spring traps when a would-be treasure-seeker is most confident. Leng spiders thrive on being underestimated.

Leng spiders have a complex society and are readily able to wage war on those who infringe on their territory. Unless in their homes, they rarely fight to the death and will retreat if severely wounded.

Section 15: Copyright Notice

Sandy Petersen’s Cthulhu Mythos, © 2017, Petersen Games; Authors: Sandy Petersen, Arthur Petersen, Ian Starcher.

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