From Native American Myth
The Serpent Woman
Colossal Monstrous Humanoid (Aquatic)
Hit Dice: 40d8+760 (940 hp)
Initiative: +5
Speed: 40 ft. (8 squares), Swim 100'
Armor Class: 30 (-8 Size, +1 Dex, +27 Natural), touch 3, flat-footed 29
Base Attack/Grapple: +40/+81
Attack: Claw +57 melee (2d6+25)
Full Attack: 2 Claws +57 melee (2d6+25) and 1 Bite +52 melee (1d10+13)
Space/Reach: 30 ft./20 ft.
Special Attacks: Serpent Curse, Mesmerizing Appearance, Mesmerizing Presence, Mesmerizing Gaze, Improved Grab, Constrict (4d6+50)
Special Qualities: Low Light Vision, Dark Vision 60', Amphibious, Telepathy (1 mile, Serpentoids only), Scent, Immunities, Damage Reduction 10/Epic, Spell Resistance 40
Saves: Fort +32, Ref +29, Will +35
Abilities: Str 60, Dex 12, Con 48, Int 20, Wis 24, Cha 35
Skills: Balance +9, Bluff +30, Climb +45, Concentration +27, Heal +25, Hide +9, Intmidate +32, Knowledge (Arcana, History, Local, Nature) +25, Listen +32, Move Silently +21, Search +25, Sense Motive +27, Spot +31, Survival +25, Swim +28, Use Magic Device +23
Feats: Ability Focus (Mesmerizing Appearance, Mesmerizing Presence, Mesmerizing Gaze), Blind-Fight, Epic Reflexes, Epic Will, Greater Multigrab, Improved Initiative, Improved Scent, Iron Will, Lightning Reflexes, Multigrab, Narrowed Gaze, Pervasive Gaze, Uncanny Scent
Environment: Cold or temperate aquatic
Organization: Unique, plus 10-30 humanoid males with the Serpentoid Template
Challenge Rating: 26
Treasure: Double Standard
Alignment: Chaotic Neutral
Advancement: 41+ HD (Collosal)
Level Adjustment: ----
"If your wife disappeared near the lakes, you will not be seeing her again. For the sake of everyone it is best you forget about her as best you can. Don't go to the Lakes, or you may find yourself with a new wife not of your choosing..."
The Serpent Woman is a 100' long monster living in the Great Lakes. She appears to be a beautiful woman from the waist up, and a monstrous serpent from the waist down. Her haunting beauty is marred slightly by the fangs protruding from her lips, clawed hands, and the scales covering her skin. Long ago her one true love (a human man) was murderd by the tribal shamans for consorting with her (apparently monster/human love is forbidden), and she has hated humanity ever since. Using her movements, voice, and gaze she mesmerizes humans who come near the lakes taking them as lovers. After a few days in her company they start to become snake men, leaving their tribe behind forever.
Serpent Curse (Su): Any humanoid spending time with the Serpent Woman (i.e. in close proximity) for several days begins to turn into a serpent man. Effectively every day the humanoid spends within 60' of her (which is likely because she probably wont let go of him) must make a DC 42 Fortitude Save or he gains the Serpentoid Template permanently. It may not be removed once gained except by a Wish or Miracle spell. Since the Serpent Woman usually kills women it is unknown if it affects them. She is in constant telepathic contact with all victims of her curse, and only loses touch with them if they are over 1 mile away from her. Unlike many monsters the Serpent Woman actually cares for her victims providing thm with food, shelter, and affection. Killing one means her undying wrath, and anyone doing so will have to kill her as well or be pursued for the remainder of their days.
Mesmerizing Appearance (Su): Anyone able to see the Serpent Woman must make a DC 44 Willpower Save (Save DC is Charisma based), or be unable to attack her. They will instead merely stand there Fascinated until either she is out of sight, or notices them. If they succeed they are immune to this ability for 24 hours.
Mesmerizing Presence (Su): Once the Serpent Woman is aware of her Fascinated prey she will begin to talk to it. Anyone hearing the Serpent Woman's voice must make a DC 44 Willpower Save (Save DC is Willpower based) or be affected as if by a Charm Monster spell.
Mesmerizing Gaze (Su): Dominate Monster, 120', Willpower Save DC 44 negates. Mesmerizing Gaze only works on opponents that have been Charmed by her already.
Improved Grab (Ex): If the Serpent Woman successfully hits with her claw attack she may immediately make a Grapple check as a Free Action without provoking an attack of opportunity. If successful she may Constrict the next round.
Constrict (Ex): The Serpent woman may do 4d6+50 damage with a successful Grapple check.
Immunities (Ex): The Serpent Woman is immune to Sleep effects, poison, paralysis, disease, and fear/morale effects.
Skills: The Serpent Woman has a +4 Racial Bonus on Hide, Listen, and Spot checks. She also has a +8 Racial Bonus on Balance, Climb, and Swim checks. She can always take 10 on a Climb check even if rushed or threatened, and may always take 10 on a Swim check even if distracted or endangered.
Combat: The Serpent Woman usually isn't required to be in combat. Opponents usually end up Fascinated or Charmed, and end up her servants/lovers if men. Females however she will generally approach, and not break her Charm/Domination until grappling the female victim. At which point she will grapple her, pull her underwater, and then drown her while constricting at the same time. And she usually has several servants to help as well.
SERPENTOID
Serpentoid is an Acquired Template that can be added to any humanoid.
Size and Type: Type becomes Monstrous Humanoid with the Reptilian and Aquatic subtypes. Size is unchanged.
Hit Dice: Unchanged.
Speed: If the Base Creature doesn't have a Swim or Climb speed, it gains them equal to it's Land Speed
Armor Class: Natural Armor Bonus increases by +2.
Attacks: If the Base Creature doesn't already have a Primary Bite and Secondary Claw attack it gains them. Damage depends on Size. Bite is 1d4 for Small, 1d6 for Medium, and 1d8 for Large. Claws are 1d3 for Small, 1d4 for Medium, and 1d6 for Large. When performing a Full Attack they get 1 Bite and 2 Claws.
Damage: Unchanged
Special Attacks: Keeps all Special Attacks of the Base reature and gains the following:
Improved Grab (Ex): If the Serpentoid hits with it's Bite attack it may immediately make a Grapple check as a Free Action without provoking an attack of opportunity. If successful it may Constrict the next round.
Constrict (Ex): A Serpentoid does double it's Bite damage plus one and a half times it's Strength modifier with a successful Grapple check.
Special Qualities: Keeps all Special Qualities of the Base Creature and gains the following:
True Love (Ex): Anything acquiring the Serpentoid Template is the willing and complete slave of the Serpent Woman. They will not disobey any of her orders and will gladly die for her. The only way to change this is to remove the Serpentoid Template, which can be done by Miracle or Wish. If removed from the Serpent Woman the Serpentoid will attempt to get back to her side at all costs, and take his own life if it becomes obvious he cannot. Should she be killed he will do his best to murder those resposnible, and take his own life after they are gone. Even victims who have been cured sometimes willingly return to her, saying that life with her was better than it was with their tribe (especially considering the prejudices they sometimes face upon return).
Amphibious (Ex): Serpentoids can breathe in water and air equally well.
Scent (Ex)
Saves: Recalculate any Saves you get from Racial Hit Dice since your type has changed.
Abilities: +6 Str, +6 Dex, +2 Con, +2 Wis, -2 Int, -6 Cha
Skills: Serpentoids have a +4 Racial Bonus on Hide, Listen, and Spot checks. They also have a +8 Racial Bonus on Balance, Climb, and Swim checks. They can always take 10 on a Climb check even if rushed or threatened, and may always take 10 on a Swim check even if distracted or endangered. Serpentoids may use their Str or Dex modifier for Climb checks, whichever is better.
Feats: Unchanged.
Environment: Cold or Temperate Aquatic
Organization: Single, Pair, Group (3-6), or Mob (12-20)
Challenge Rating: +1?
Treasure: Unchanged
Alignment: Becomes the same as the Serpent Woman's (currently CN).
Advancement: Unchanged
Level Adjustment: +2
Example of creature using template here:
Walking Snake (Human Fighter 5)
Medium Monstrous Humanoid (Reptilian, Aquatic)
Hit Dice: 5d10+20 (47 hp)
Initiative: +7
Speed: 30 ft. (8 squares), Swim 30', Climb 30'
Armor Class: 15 (+3 Dex, +2 Natural), touch 13, flat-footed 12
Base Attack/Grapple: +5/+10
Attack: Claw +10 melee (1d3+5) or by weapon +10
Full Attack: 2 Claws +10 melee (1d4+5) and 1 Bite +5 melee (1d6+2) or by weapon +10
Space/Reach: 5 ft./5 ft.
Special Attacks: Improved Grab, Constrict (2d6+7)
Special Qualities: Dark Vision 60', Amphibious, Scent
Saves: Fort +7, Ref +4, Will +3
Abilities: Str 21, Dex 16, Con 16, Int 6, Wis 14, Cha 8
Skills: Balance +11, Climb +15, Hide +7, Intimidate +1, Jump +7, Listen +6, Spot +6, Swim +15
Feats: Power Attack, Cleave, Great Cleave, Improved Toughness, Improved Initiative
Challenge Rating: 6
Treasure: Standard
Alignment: Chaotic Neutral
Advancement: By characrer class
Level Adjustment: +2