Bonebound Hermit Spider

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Large Monstrosity, Neutral Evil

Armor Class 18 (natural armor)

Hit Points 120 (16d10+32)

Speed 20 ft. climb 20 ft.

STR 18 (+4)

DEX 14 (+2)

CON 14 (+2)

INT 3 (-4)

WIS 12 (+1)

CHA 6 (-2)

Saving Throws Con +4

Skills Perception +5

Senses darkvision 60 ft., passive Perception 15

Languages Common

Challenge 7 (2,900 XP) Proficiency Bonus +2

Interlocking Bone Shield. A massive shield of scavenged bones interlocks across the spider's abdomen. While the rear is tucked into a crevice, the shield grants a +2 bonus to AC against attacks made from behind and provides cover-like protection against incoming melee strikes from that direction.

Hermit Crab Tactics. When the Bonebound Hermit Spider backs into a crevice and seals its abdomen, it gains advantage on Opportunity Attacks against enemies that attempt to pull it out. While tucked, it is effectively protected from all angles except the exposed front.

Actions

Multiattack. The creature makes two Pincer attacks and one Bite attack.

Pincer. Melee weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 15 (2d8+6) slashing damage.

Bite. Melee weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6+4) piercing damage. If the target is a Medium or smaller creature, it must succeed on a DC 15 Strength saving throw or be knocked prone.

Tunnel Collapse (Recharge 5-6). The Bonebound Hermit Spider causes a tremor within a 15-foot radius. Each creature in that area must succeed on a DC 14 Dexterity saving throw or be knocked prone and take 14 (4d6) bludgeoning damage on a failed save, or half as much on a successful one.

Bonus Actions

Deploy Shell Shield. The spider tightens its bone shield, granting itself +2 AC until the start of its next turn as the interlocking bones cinch tighter around its abdomen.

Environment Mountain, Cave

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Lore & Description

Appearance

A massive, bulbous arachnid with a carapace of chitinous plates tinted in ash-gray and bone-white. Its abdomen is armored behind a shingle-like shield made from scavenged bones that interlock like a tiled carapace. Legs sprawl in ragged, jointed segments, each ending in a dark claw. The creature dwells in cavernous tunnels, often backing into mountain crevices to seal its armored rear from all flanks, like a subterranean hermit crab seeking safety inside a rock shelter.

Behavior & Origins

The Bonebound Hermit Spider is a nocturnal ambusher of high mountain caves. It scavenges animal remains, incorporating bones into a fearsome, shield-like abdomen. When threatened, it retreats backward into crevices, turning its vulnerable underside into a sealed chamber of bone and sinew. Its presence tells of long subterranean hunts and a cunning that blends defense with predation. Adventurers may encounter its bone-sheathing silhouette just beyond a tunnel bend, or hear the dull scraping of bone against stone as it repositions its armored hide for maximum protection.

Monster Image

Generation Info

Original prompt:
"A Large, cave-dwelling arachnid that uses a massive, interlocking shield of scavenged bones to protect its vulnerable abdomen. It functions like a subterranean hermit crab, backing its heavily armored rear into mountain crevices to seal off all angles of attack."

Created: May 24, 2026
Modified: May 31, 2026