Small (Outsider (Chaotic, Extraplanar, Evil)) CR 2
HP 13, hd2d8+4 AC 16 (+1 size, +5 natural), touch 11, flat-fooded 16 Fort +5, Ref +3, Will +3 Speed 20 ft. (4 squares) Initiative +0 Spot , Listen
Standard attacks BAB +2, Grapple ?1
Attacks
Full attack: 2 claws +4 melee (1d6+1) and bite +2 melee (1d4)
Special Attacks/Qualities
Spell-like abilities, summon demon
Damage reduction 5/cold iron or good, darkvision 60 ft., immunity to electricity and poison, resistance to acid 10, cold 10, and fire 10, telepathy 100 ft.
Skills Hide +9, Listen +5, Move Silently +5, Spot +5, Search +2, Survival +0 (+2 following tracks)
Feats Multiattack
Str 12 Con 14 Dex 10 Int 5 Wis 11 Cha 11
Alignment Always chaotic evil, Environment A chaotic evil-aligned plane, Organisation Solitary, pair, gang (3?5), crowd (6?15), or mob (10?40)

A dretch is about 4 feet tall and weighs about 60 pounds.
Dretches cannot speak but can communicate telepathically.

Dretches are slow, stupid, and not very effective combatants. In one-on-one combat, they rely on their damage reduction to keep them alive. In groups, they depend on sheer numbers to overcome foes and immediately summon other dretches to improve the odds in battle. They flee at the first sign of adversity unless more powerful demons are present to intimidate them into fighting. Dretches? fear of their greater kin is stronger then even their fear of death.
A dretch?s natural weapons, as well as any weapons it wields, are treated as chaotic-aligned and evil-aligned for the purpose of overcoming damage reduction.
Spell-Like Abilities: 1/day?scare (DC 12), stinking cloud (DC 13). Caster level 2nd. The save DCs are Charisma-based.
Summon Demon (Sp): Once per day a dretch can attempt to summon another dretch with a 35% chance of success. This ability is the equivalent of a 1st-level spell.
Telepathy (Su): Dretches can communicate telepathically with creatures within 100 feet that speak Abyssal.

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System Reference Document -> List of Creatures (SRD)