Blightwalker Ranger type

 Corruption Aurora. A creature that touches the blight Walker or hits it with a melee attack within 5 feet of it takes 2d8 necrotic damage.

 Vile touched. When the blightwalker makes a successful attack against a Target he Target becomes vile touched any healing done to the Target is instead considered vile damage and the target takes damage instead of healing the amount rolled healing can only be done on concentrated or Hallowed Ground.  in addition Target will take 1d6 vile damage each day at dawn.

 Shadow travel. If the blightwalker is in dim light or Darkness it can see it can teleport up to 60 ft within same damn light or Darkness. White Walker Gaines advantage on attack against any Targets until the end of turn.

Mobile.  when blightwalker dashes it is not affected by difficult Terrain it also does not provoke opportunities of attack when it uses a melee attack.

 Multiattack. Blight Walker makes four longbow or Rapier attacks

 Longbow. +8 to hit, range 150/600 ft., one target. Hit: 8(1d8 + 4) piercing damage. 

 Rapier. + 8 to hit, reach 5 ft., one target. Hit: 8 ( 1d8 + 4) slashing damage.

 Deathgaze. The blightwalker targets one creature it can see within 30 feet of it. The target must succeed on a DC 16 Constitution saving throw against this magic or take 3d10 necrotic damage

Hunters mark. As a bonus action the blightwalker King cast Hunter's Mark on a Target when the target receives damage they can take an additional 1D6 damage from Hunter's Mark.