Bog Maid

Size/Type: Medium Fey Humanoid (Aquatic)
Hit Dice: 7d8+14 (45 hp)
Initiative: +3
Speed: Walk 40 ft. (8 squares), Swim 30 ft. (6 squares)
Armor Class: 19 (+3 Dex, +6 natural), touch 13, flat-footed 16
Base Attack/Grapple: +7/+18
Attack: Claw +13 melee (1d6+5)
Full Attack: 2 claws +11 melee (1d6+5) and rancid bite +6 melee (2d6+1)
Space/Reach: 10 ft./10 ft.
Special Attacks: Improved grab, rake 1d6+7, rancid bite 2d6+1, spell-like abilities
Special Qualities: Damage reduction 2/bludgeoning, darkvision 60 ft., shape change, spell resistance 19, swamp walk
Saves: Fort +6, Ref +8, Will +6
Abilities: Str 21, Dex 16, Con 14, Int 13, Wis 13, Cha 14
Skills: Bluff +6, Diplomacy +4, Disguise +6 (+8 when shape changed), Hide +6, Intimidate +2, Listen +10, Spot +10
Feats: Alertness, Great Fortitude
Environment: Marshes, bogs and swamps
Organization: Solitary or covey (3 maids of various enticing forms)
Challenge Rating: 6
Treasure: Standard
Alignment: Usually chaotic evil
Advancement: By character class
Level Adjustment: —

These sirens of the swamp have been known to lure many an adventurer into brackish waters and bramble patches.

Combat

Bog maids usually draw upon their shape change ability to alter its physical form to appear as a beautiful young female elf, half-elf, or other humanoid. Then, they grapple their opponents in what seems a lustful embrace, proceeding to bite into them with their rancid maws.

Rancid Bite (Ex): The rancid bite of a bog maid deals 2d6+1 damage. In addition, a DC 18 Fortitude save is required to avoid 1d4 temporary Con damage.

Skills

Shape Change (Ex): Bog maids have the natural ability to change their shape into other humanoid forms, typically choosing a beautiful maiden of a humanoid species.

Swamp Walk (Ex): Because of their innate knowledge of the terrain, bog maids can move at normal speed through swamp, marsh, and bog.

Thanks to Rakehell over at Tailslap for the 4e version of this creature!