Bone devils stand about 9 feet tall and weigh about 500 pounds.

Bone devils hate all other creatures and attack ruthlessly. They freely use wall of ice to keep the enemy divided.
A bone 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.
Fear Aura (Su): Bone devils can radiate a 5-foot-radius fear aura as a free action. Affected creatures must succeed on a DC 17 Will save or be affected as though by a fear spell (caster level 7th). A creature that successfully saves cannot be affected again by the same bone devil?s aura for 24 hours. Other devils are immune to the aura. The save DC is Charisma-based.
Poison (Ex): Injury, Fortitude DC 20, initial damage 1d6 Str, secondary damage 2d6 Str. The save DC is Consitution-based.
Spell-Like Abilities: At will?greater teleport (self plus 50 pounds of objects only), dimensional anchor, fly, invisibility (self only), major image (DC 15), wall of ice. Caster level 12th. The save DC is Charisma-based.
Summon Devil (Sp): Once per day a bone devil can attempt to summon 2d10 lemures with a 50% chance of success, or another bone devil with a 35% chance of success. This ability is the equivalent of a 4th-level spell.

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System Reference Document -> List of Creatures