Encounters: Cormyrean Marshes - The Farseas Marsh

Monstrous Centipede, Gargantuan (CR 6)

Gargantuan Vermin
Alignment: Always Neutral
Initiative: +2 (Dex); Senses: darkvision 60 ft. and Spot +4

AC: 18 (-4 size, +2 Dex, +10 natural), touch 8, flat-footed 16
Hit Dice: 12d8+12 (66 hp)
Fort +9, Ref +6, Will +4

Speed: 40 ft., climb 40 ft.
Space: 20 ft./15 ft.
Base Attack +9; Grapple +27
Attack: Bite +11 melee
Full Attack: Bite +11 melee
Damage: Bite 2d8+9 and poison
Special Attacks: Poison

Abilities: Str 23, Dex 15, Con 12, Int -, Wis 10, Cha 2
Special Qualities: Vermin
Feats: -
Skills: Climb +14, Hide -2, and Spot +4
Advancement: 17-23 HD (Gargantuan)

Climate/Terrain: Any underground
Organization: Solitary
Treasure: None

Source: Monster Manual

Poison (Ex): Fortitude save DC 26, initial and secondary damage 1d8 point Dexterity.

Skills: Monstrous centipedes receive a +4 racial bonus to Climb, Hide, and Spot checks.

Monstrous centipedes tend to attack anything that resembles food, biting with their jaws and injecting their poison.

These creatures travel wherever hunger leads them. They prefer to feed on small animals but do not hesitate to attack humanoids or other larger prey. Monstrous centipedes are long and low: 60 feet long, 8 feet wide* and 4 feet high. *This number includes the centipede's body and its legs; the actual body width is about a third of the total.

Faerûnian Random Encounters by Region and Locale