As a Devil you have resistance to Bludgeoning, Piercing, and Slashing attacks made by non magical weapon attacks as well as weapon attacks without Silver.

Devils are Immune to to Cold, Fire, and Poison damage. As well as you can't be Poisoned.

The Devil has Advantage on Saving Throws against spells and other Magical Effects.

The devil makes three attacks, one with it's bite, one with its claws, and one with its tail.

The devil magically forms an opaque wall of ice on a solid surface it can see within 60 feet of it. The wall is 1 foot thick and up to 30 feet long and 10 feet high, or it's a hemispherical dome up to 20 feet in diameter. When the wall appears, each creature in its space is pushed out of it by the shortest route. The creature chooses which side of the wall to end up on, unless the creature is incapacitated. The creature then makes a DC 17 Dexterity saving throw, taking 35 (10d6) cold damage on a failed save, or half as much damage on a successful one. The wall lasts for 1 minute or until the devil is incapacitated or dies. The wall can be damaged and breached; each 10-foot section has AC 5, 30 hit points, vulnerability to fire damage, and immunity to acid, cold, necrotic, poison, and psychic damage . If a section is destroyed, it leaves behind a sheet of frigid air in the space the wall occupied . Whenever a creature finishes moving through the frigid air on a turn, willingly or otherwise, the creature must make a DC 17 Constitution saving throw, taking 17 (5d6) cold damage on a failed save, or half as much damage on a successful one. The frigid air dissipates when the rest of the wall vanishes.

Your darkvision can't be impeded by magical means or mundane aspects making your ability to see in the dark nearly unstoppable. 

As a Devil you have Blindsight up to 60ft and Darkvision 120ft. 

As a Devil you're not weak or pathetic by any sense and so your skills reflect your years of battle, manipulation, survival, cunning and skill.

As an Ice devil you stand in at about 8ft - 14ft tall unchanged and weigh up to 500lbs

As a Devil you live until you are killed. The passage of time doesn't affect you.

As a Devil you can speak, read, and write Infernal and Common as well as having the ability to communicate to anyone within 120ft mentally.

Your base walking speed is 40ft