Cockroach, Giant (CR 2)

Medium Vermin
Alignment: Always neutral
Initiative: +4 (Dex); Senses: darkvision 60 ft., scent, and tremorsense

AC: 20 (+4 Dex, +6 natural), touch 14, flat-footed 16
Hit Dice: 4d8+12 (30 hp)
Fort +7, Ref +5, Will +1
Speed: 40 ft., climb 40 ft.
Space: 5 ft./5 ft.
Base Attack +3; Grapple +8
Attack: Bite +8 melee (1d6+7)
Full Attack: Bite +8 melee (1d6+7)
Damage: -
Special Attacks/Actions: Stench
Abilities: Str 21, Dex 18, Con 16, Int -, Wis 10, Cha 2
Special Qualities: vermin traits
Feats: -
Skills: -
Advancement: 5-8 HD (Medium); 8-12 HD (Large)
Climate/Terrain: Underground
Organization: Solitary, swarm (3-10), or aggregate (11-20)
Treasure/Possessions: None

Source: Underdark

Stench (Ex): A giant cockroach secretes oily chemicals that nearly every form of animal life finds offensive. Every creature (except cockroaches) within 30 feet of the giant cockroach must make a DC 15 Fortitude save or be nauseated for 1d4 rounds. Whether or not the save is successful, the creature cannot be affected again by any giant cockroach's stench for 1 hour. The save DC is Constitution-based.

Tremorsense (Ex): A giant cockroach can automatically sense the location of any creature or object within 60 feet that is in contact with the ground.

Skills: A giant cockroach receives a +12 racial bonus on Climb checks. (This value includes the racial bonus for a natural climb speed.) It can always choose to take 10 on Climb checks even if rushed or threatened. A giant cockroach also receives a +10 racial bonus on Hide checks and a +6 racial bonus on Move Silently checks

Giant cockroaches are far more aggressive than their normal-sized cousins, belligerently attacking almost anything that moves.