Magical objects (GOT)

The Ice Blade of the Night King

 * Crystal, translucent, faint blue shimmer.

The Horn of Winter

 * Has the power to bring down the wall and summon the giants.

Dragonbinder

 * The horn that binds dragons.
 * Also called the Hellhorn
 * Is covered in Valyrian glyphs.

Wildfire

 * Volatile green liquid.
 * Created by the Alchemists Guild

Dragonglass

 * Forged from the fire of dragons.
 * Can kill white walkers.

Valyrian Steel

 * The most powerful swords.