Devils sight.

Spellcasting. yanesal is a 4-level spellcaster. His spellcasting ability is charisma (spell save DC 14, +5 to hit with spell attacks).Yanesal has following spells prepared requiring no material components

 at will: fireball, burning hands
once per day: plane shift                                                                                 

demogorgans fang. Melee Weapon Attack: +4 to hit, reach 5 ft., 1 target. Hit: 12 (3d6 + 4) slashing damage. 

Demonic touch. Melee Weapon Attack: +6 to hit, reach 5 ft., 1 target. Hit: 3 (1d4 + 2) fire damage. the target must make a dc 13 constitution saving throw or be frightened till the end of yanesals next turn

demogorgans fang(dagger). RangedWeapon Attack: +7 to hit, range 30/100 ft., 1 target. Hit: 10 (1d12 + 4) piercing damage.

jump.if an attack hits yanesal can jump up to 40 ft away