Chained Bloodfrost Tiefling

Devil's Sight: Can see in darkness and darkness created by magical means up to 120ft. 

Bloodfrost Aura: While a creature is within 10ft, at the start of its turn it takes 9(3d6) cold damage while a misty frost eminates from the Chained Bloodfrost Tiefling. 

Innate Spellcasting. The Chained Bloodfrost Tiefling spellcasting ability is Intelligence (spell save DC 16). The Chained Bloodfrost Tiefling can innately cast the following spells, requiring no components:
At Will:  Magnify Gravity, Darkness, Sending

1/day each: Plane Shift (self only), Cone of Cold, Summon Lesser Demons

Multiattack. The Chained Bloodfrost Tiefling makes three melee Attacks or two ranged weapon attacks.

Chained Hand Axe. Melee Weapon Attack: +9 to hit, reach 5 ft., 1 target. Hit: 8 (1d6 + 4) slashing damage and 8(2d8) cold damage.

Chained Hand Axe. Ranged Weapon Attack: +9 to hit, range 30/90 ft., 1 target. Hit: # 8(1d6 + 4) slashing damage and 8(2d8) cold damage. If the creature misses with a ranged weapon attack a chain that is attach to the grip of the handle quickly reels the weapon back into its hand. 

If both ranged attacks hit the same target, as a bonus action, the Chained Bloodfrost Tiefling pulls the target towards itself. The target must succeed on a DC 16 Strength saving throw or be moved within 5ft of the Chained Frost Tiefling, be knocked prone, and takes an additional 16(4d8) cold damage as the two chained hand axes rip out of the target as a burst of cold seeps into it during that time. If only one ranged attack hits the target the Chained Bloodfrost Tiefling's hand axe rips out of the target back into its hand.