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The Sanguine Broodmother - AI-generated fantasy Monster

The Sanguine Broodmother

Concocted by the Sect of the Veined Moon, the Broodmother was once a giant subterranean spider, warped by weeks of blood-letting and abyssal chants. She is now the heartbeat of the Undermyr's infestation.

Monsters
Gargantuan monstrosity · CR 10 · Unique

The Sanguine Broodmother

A massive, wall-anchored spider creature born from drow blood magic, acting as a biological factory for vampiric spiderlings.
AC17
HP172/172
CR10
Init
STR
DEX
CON
INT
WIS
CHA
ConditionsNone

Combat

AC 17 · HP 172 · CR 10

The Sanguine Broodmother

Gargantuan monstrosity (spider), chaotic evil
Armor Class17 (Natural Armor)
Hit Points172 (15d20 + 90)
Speed
0 ft.
STR
DEX
CON
INT
WIS
CHA
Saving ThrowsCONWIS
SkillsPerceptionAthletics
Damage Resistances
Bludgeoning, Piercing, and Slashing from Nonmagical Attacks
Immunities
Charmed,
Frightened,
Prone,
Restrained
Weaknesses
Fire
Senses
Blindsight 60 ft.,
Tremorsense 120 ft.,
Passive Perception 16
Languages
Understand Abyssal and Undercommon but cannot speak
Challenge10
Rooted Monstrosity. The Broodmother is fused to the cavern wall. She has a speed of 0 and automatically fails Dexterity saving throws. She cannot be moved by any means short of a Wish spell.
Spiritual Umbilical. The Broodmother is linked to High Priestess Valthara. While the cord is intact, half of any damage the Broodmother takes is transferred to Valthara. If Valthara dies, the Broodmother enters a Frenzy, making three leg strikes as a bonus action.
Brood Burst. When the Broodmother takes more than 30 damage in a single turn, a Swarm of Blood Spiders bursts from her sac and lands in an unoccupied space within 10 feet.

Actions

Multiattack. The Broodmother makes four Leg Strikes.
Leg Strike. Melee Weapon Attack: to hit, reach 20 ft., one target. Hit: 18 () piercing damage. If the target is a creature, it must succeed on a Strength saving throw or be grappled (escape ).
Sanguine Spray (Recharge 5-6). The Broodmother sprays caustic, sticky blood in a 30-foot cone. Each creature in that area must make a Dexterity saving throw. On a failure, a creature takes 36 () acid damage and is restrained by hardened blood. On a success, it takes half as much damage and is not restrained.

Reactions

Protective Lash. When a creature moves within 20 feet of the Broodmother, she can make one Leg Strike against that creature.

Legendary Actions

Spawn Swarm. The Broodmother births a Swarm of Blood Spiders into an adjacent space.
Sac Twitch. The Broodmother's abdomen pulses. Every creature currently restrained by her webs or blood takes 10 () necrotic damage as tiny spiders bite them.
Impale (costs 2 actions). The Broodmother makes one Leg Strike with advantage. If it hits, the target is knocked prone.
Role
Area Hazard, Boss Stage 1
Built for
8

Feats

Great Weapon Master (applied to leg strikes)

Augmentations

Enchanted with 'Blood Bond' ritual

Notes for the game master

Stationary status is balanced by high reach and multi-attacks
Encourage players to target the umbilical cord (AC 15, 30 HP) to stop damage sharing

Tactics

  1. Opening

    Spends the first turn using Sanguine Spray to restrain as many enemies as possible while the High Priestess chants from the balcony above.

  2. Mid-fight

    Focuses on grappling spellcasters and pulling them into the 'splash zone' for her Spawn Swarm legendary action.

  3. End of the fight

    If reduced below 50 HP, she stops birthing swarms and uses all legendary actions to attack with Impale, trying to crush the closest threat.

  4. Retreat

    Cannot retreat. If the sac is destroyed, she emits a death-screech that deals 2d10 thunder damage to everyone within 60 feet.

How it fights

Uses reach to keep melee fighters at a distance
Targets creatures who have been restrained by the Sanguine Spray
Ignores summons to focus on the biological life force of the adventurers

Who it attacks first

Clerics (to stop healing)
Ranged attackers hitting the umbilical cord
Anyone within 5 feet of her abdominal sac

Works well with

High Priestess Valthara (Damage sharing and buffs)
Crimson Swarms (Distraction and chip damage)
Drow Archers (Sniping from balconies while the Broodmother keeps melee busy)

How to beat it

Dispel Magic on the umbilical cord
Heavy Fire damage to ignite the webbing
Forced movement onto the High Priestess to disrupt the ritual

Ways to avoid a fight

Tainting the blood supply leading to the pit
Intimidation or Persuasion with the High Priestess to halt the ritual

Ecology

A colossal arachnid horror fused into the cavern walls by thick, obsidian-like webbing. Her abdomen is a horrific, translucent sac of pulsating crimson fluid, teeming with thousands of skittering spiderlings. Eight elongated, multi-jointed legs reach out like spears, while a glowing spiritual cord of red energy connects her spine to the high priestess above.

Behavior

Purely defensive and reproductive. She lash out at anything that breathes, driven by a supernatural hunger to protect her developing brood.

How it lives

The Sanguine Broodmother is a magical construct of biology, requiring constant infusions of fresh blood to sustain the rapid gestation of the Crimson Swarms.

Lair

A cavern coated in sticky, blood-soaked webbing with central pits used for sacrificial offerings.

Habitat
The Birthing Pits of Undermyr

Signs that it is near

Walls coated in rhythmic, pulsating webbing
Small glowing red spiders skittering in cracks
The heavy smell of metallic blood and ozone

Tags

Spider,
Blood Magic,
Stationary

Lore

Concocted by the Sect of the Veined Moon, the Broodmother was once a giant subterranean spider, warped by weeks of blood-letting and abyssal chants. She is now the heartbeat of the Undermyr's infestation.

What drives it

To protect the brood and serve as the anchor for Valthara's ritual.

After the fight

Once killed, the Birthing Pits become unstable. The party has 3 rounds to escape before the ceiling, no longer held by her webbing, collapses.

Variants

Venomous Broodmother (Poison damage instead of Acid)
Undead Broodmother (Immune to necrotic, lower HP but rises once as a skeleton)

Hooks

Plot hooks

The local garrison is being overrun by red spiders and needs the source destroyed.
A rogue drow wants to sabotage the Sect of the Veined Moon.
The blood used for the ritual was stolen from a noble family and carries a hereditary curse.

How to use it

Final boss of the first floor of a Drow dungeon
A trap encounter where the party must cross the room to reach a lever

Treasure

8000 gold in drow gemstones
Vial of Concentrated Broodmother Ichor (Rare Potion Component)
The Broodmother's Eye (Functions as a Crystal Ball of Scrying)

Media

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