How does Sam kill a white walker?

Question:

What does Sam use to kill a white walker?

Answer:

Sam uses Valyrian steel to kill a white walker.

Explanation:

Sam is able to successfully kill a white walker by using a weapon made of Valyrian steel. Valyrian steel is a rare and magical metal in the Game of Thrones universe known for its ability to kill White Walkers and wights. It is said that Valyrian steel weapons are forged with spells and dragonfire, making them incredibly sharp and effective against the supernatural creatures. When Sam uses Valyrian steel to kill the white walker, he is able to strike the fatal blow and defeat the powerful enemy.