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During the conversation with Liath in the second quest echo in Ending the Storm, you can make a decision which results in it unlocking Fall of the Empire instead of Reign of Dragons.
The connection to Blood, Frost, and Death is in the other direction to your diagram. It's unlocked by a choice in Blood, Frost, and Death, not one in Ending the Storm, so it doesn't contribute towards the Ending the Storm branches objective.