5e SRD:Bone Devil
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Large fiend (devil), lawful evil
Saving Throws Int +5, Wis +6, Cha +7
Devil's Sight. Magical darkness doesn't impede the devil's darkvision.
Magic Resistance. The devil has advantage on saving throws against spells and other magical effects.
Multiattack. The devil makes three attacks: two with its claws and one with its sting.
Claw. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 8 (1d8 + 4) slashing damage.
Sting. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 13 (2d8 + 4) piercing damage plus 17 (5d6) poison damage, and the target must succeed on a DC 14 Constitution saving throw or become poisoned for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Driven by hate, lust, and envy, bone devils act as the cruel taskmasters of the Nine Hells. They set weaker devils to work, taking special delight in seeing fiends that defy them demoted. At the same time, they long for promotion and are bitterly envious of their superiors, attempting to curry favor though it irks them to do so.