I just reblogged five posts back to back all relating to the Ghost of High Heart's prophecy about Sansa "slaying a savage giant in a castle built of snow". They all brought up many interesting arguments about how the scene in ASOS Sansa VII where Robert destroys Sansa's snow castle and she rips his doll may fit the prophecy, and in favor of/against the identity of the giant being Littlefinger or Sweetrobin. For the sake of clarity as the posts were follow-ups/replies to each other, below is a mini compilation in chronological order.
@/queen--of--thorns' post in favor of Littlefinger being the savage giant Sansa is prophecized to slay: x
@/queen--of--thorns answers an ask on why they don't believe Tyrion is the savage giant: x
@/queen--of--thorns expands on why they support the Littlefinger theory: x
@donewithwoodenteeth replies to the above post, explaining why they disagree and believe Sweetrobin is the savage giant instead: x
@donewithwoodenteeth answers an ask, expanding on their interpretation of the prophecy: x
FFR and more on the subject of the GOHH's prophecy, these are the tags of interest you can browse on the blog:
scene: slaying a savage giant in a castle built of snow
tbc: Sweetrobin is the savage giant
tbc: Littlefinger is the savage giant













