A horned devil is 9 feet tall and weighs about 600 pounds.

Horned devils are bold fighters. They rarely retreat, even against overwhelming odds. They love to fight with their spiked chains, usually singling out the most powerful foes to stun and eliminate quickly.
A horned devil?s natural weapons, as well as any weapons it wields, are treated as evil-aligned and lawful-aligned for the purpose of overcoming damage reduction.
Spell-Like Abilities: At will?dispel chaos (DC 21), dispel good (DC 21), magic circle against good, greater teleport (self plus 50 pounds of objects only); persistent image (DC 21) 3/day?fireball (DC 19), lightning bolt (DC 19). Caster level 15th. The save DCs are Charisma-based.
Fear Aura (Su): A horned devil can radiate a 5-foot-radius fear aura as a free action. A creature in the area must succeed on a DC 23 Will save or be affected as though by a fear spell (caster level 15th). A creature that successfully saves cannot be affected again by the same horned devil?s aura for 24 hours. Other devils are immune to the aura. The save DC is Charisma-based.
Stun (Su): Whenever a horned devil hits with a spiked chain attack, the opponent must succeed on a DC 27 Fortutude save or be stunned for 1d4 rounds. The save DC is Strength-based. This ability is a function of the horned devil, not of the spiked chain.
Infernal Wound (Su): The damage a horned devil deals with its tail attack causes a persistent wound. An injured creature loses 2 additional hit points each round. The wound does not heal naturally and resists healing spells. The continuing hit point loss can be stopped by a DC 24 Heal check, a cure spell, or a heal spell. However, a character attempting to cast a cure spell or a heal spell on a creature damaged by a horned devil?s tail must succeed on a DC 24 caster level check, or the spell has no effect on the injured character. A successful Heal check automatically stops the continuing hit point loss as well as restoring hit points. The check DC is Consitution-based.
Summon Devil (Sp): Once per day a horned devil can attempt to summon 2d10 lemures or 1d6 bearded devils with a 50% chance of success, 1d6 barbed devils with a 35% chance of success, or another horned devil with a 20% chance of success. This ability is the equivalent of a 6th-level spell.
Regeneration (Ex): A horned devil takes normal damage from good-aligned silvered weapons, and from spells or effects with the good descriptor.

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System Reference Document -> List of Creatures (SRD)