Large (Aberration) CR 4
HP 36, hd6d8+9 AC 17 (?1 size, +8 natural), touch 9, flat-fooded 17 Fort +3, Ref +2, Will +6 Speed 20 ft. (4 squares) Initiative +0 Spot , Listen
Standard attacks BAB +4, Grapple +8
Attacks
Full attack: 2 tentacles +4 melee (1d6) and bite ?2 melee (1d4)
Special Attacks/Qualities
Constrict 1d6, disease, improved grab
Darkvision 60 ft., scent
Skills Hide ?1*, Listen +6, Spot +6
Feats Alertness, Toughness, Weapon Focus (tentacle)
Str 11 Con 13 Dex 10 Int 5 Wis 12 Cha 6
Alignment Usually neutral, Environment Underground, Organisation Solitary, pair, or cluster (3?4)

A typical otyugh has a body 8 feet in diameter and weighs about 500 pounds.
Otyughs speak Common.

An otyugh attacks living creatures if it feels threatened or if it is hungry; otherwise it is content to remain hidden. Otyughs slash and squeeze opponents with their tentacles, which they also use to drag prey into their mouths.
Constrict (Ex): An otyugh deals automatic tentacle damage with a successful grapple check.
Disease (Ex): Filth fever?bite, Fortitude DC 14, incubation period 1d3 days; damage 1d3 Dexand 1d3 Con. The save DC is Consitution-based.
Improved Grab (Ex): To use this ability, an otyugh must hit with a tentacle attack. It can then attempt to start a grapple as a free action without provoking an attack of opportunity. If it wins the grapple check, it establishes a hold and can constrict.
Skills: *An otyugh has a +8 racial bonus on Hide checks when in its lair, due to its natural coloration.

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System Reference Document -> List of Creatures (SRD)