PS: Favorite "Game of Thrones" Magical or Mythical Creature (Ready)

Which magical or mythical non-sentient character or animal, creature or plant from the lore of "Game of Thrones" is your favorite seen or unseen creature?

SPOILER ALERT: Intended for viewers current through the Summer 2019 season as poll reveals depicted or discussed Game of Thrones (2011) characters with magical abilities or a mystical nature through Summer 2019.

Live Poll: TBD