His most famous "work" is raising fallen units as wights . In game terms, this translates to high survivability and the ability to replenish forces.
The Night King is also highly resistant to injury, and can withstand even the most severe wounds. He is also highly intelligent, and is able to strategize and plan his attacks with precision.
As the series comes to a close, the Night King remains a powerful and enigmatic figure, driven by a single-minded purpose to bring eternal night and destroy all life in Westeros. His legacy will live on, even as the living fight to survive and reclaim their land.
The Night King is a formidable foe, but the living have one advantage: their ability to work together and use their unique skills to their advantage. The Night King may have the power of the White Walkers on his side, but the living have something that he does not: their humanity.