In both "A Song of Ice and Fire," George R.R. Martin's series of fantasy novels, and "Game of Thrones," its HBO adaptation, readers and viewers meet the White Walkers , an undead army of frozen zombies who emerge from the far North to attack Westeros and its seven kingdoms. Seemingly unkillable and downright terrifying, the White Walkers, the eldest of whom are ancient beings that pre-date the Seven Kingdoms themselves, have some seriously scary skills. Not only are they all incredibly skilled in combat, wielding weapons that are likely as old as they are, but they can reanimate corpses and turn them into "wights," which are hard but not fully impossible to destroy and are basically homing missiles that destroy anything in their path. There are only a few definitive ways to defeat true W

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