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The Mistress of the Fen

This arching, reptilian creature has an elongated neck and short fins. Its jagged teeth hint at its primordial nature, and the abundant plant growth covering its body suggests both fertility and rot.

The Mistress of the Fen CR 12

Source Mystery Monsters Revisited pg. 56
XP 19,200
Female unique water orm
N Huge magical beast (aquatic)
Init +4; Senses darkvision 120 ft., low-light vision; Perception +13


AC 26, touch 12, flat-footed 22 (+4 Dex, +14 natural, –2 size)
hp 157 (15d10+75); swamp healing 5
Fort +14, Ref +13, Will +8
Defensive Abilities elusive; Immune cold, poison; Resist electricity 20, fire 20


Speed 20 ft., swim 50 ft.
Melee bite +21 (4d6+8/19–20 plus grab and poison), tail slap +16 (2d8+4)
Space 15 ft., Reach 15 ft. (20 ft. with bite)
Special Attacks swallow whole (3d6+12 bludgeoning damage, AC 17, 15 hp)
Spell-Like Abilities (CL 15th; concentration +15)
At will—control water, freedom of movement
5/day—diminish plants, plant growth
3/day—command plants, thorn bodyAPG, wall of thorns
1/day—hydraulic torrentAPG


Str 26, Dex 18, Con 21, Int 4, Wis 13, Cha 11
Base Atk +15; CMB +25 (+27 bull rush, +29 grapple); CMD 39 (41 vs. bull rush, 43 vs. trip)
Feats Awesome Blow, Critical Focus, Improved Bull Rush, Improved Critical (bite), Improved Iron Will, Iron Will, Power Attack, Sickening Critical
Skills Perception +13, Stealth +9 (+17 in swamps), Swim +16; Racial Modifiers +4 Perception, +8 Stealth in swamps
Languages Aquan (can’t speak)
SQ amphibious, water travel

Special Abilities

Elusive (Su) See page 280 of Pathfinder RPG Bestiary 2.

Poison (Ex) Bite—injury; save Fort DC 22; frequency 1/round for 6 rounds; effect 1d3 Con and 1d3 Dex; cure 2 consecutive saves.

Swamp Healing (Su) As long as she is in a swamp, bog, or other wetland, the Mistress of the Fen gains fast healing 5.

Water Travel (Su) See page 280 of Pathfinder RPG Bestiary 2.


She has dwelled beneath the fen for centuries, an elemental thing of the choking, rotting lands she cradles like a newborn babe. The changeling witches who worship here gave the Mistress of the Fen her name, and ask her to teach them the secret whispered words of wild places, calling to her in the dark and drowning sacrifices in her name. Though they were born to the same despicable hag mother, the witches were raised by the orm. They are beautiful beyond compare, and they use their allure and wiles to draw travelers to their swampy home. Invariably, such victims end up in the waiting jaws of the Mistress of the Fen.

Those who live on the edges of the fen avoid the place despite the lure of easy fishing and lost funeral barges said to be crammed with treasure. They know of the Mistress, her followers, and her sacrifices. Many suspect it was the changelings who gave the orm her powers over rot and fecundity, but the witches deny this, claiming that the Mistress has always possessed such gifts. Their chants can be heard at all times across the murky waters of the swamp, and on moonless nights, one can catch a glimpse of the changelings as they take turns kissing the fetid jaws of their revered mother and drinking in her pestilence.