I've not played Polaris (yet) but as I understand it the through-line of each protagonist's story is the progression from Zeal to Weariness and ultimately corruption or death. Is there a way to have mechanical support for that in this game? (Love what you've done here if it's not obvious)
Viewing post in Under the Snowflakes and Stars comments
The procedure for that isn't explicitly mechanized. It's up to the players to enact it (using scene framing questions and other tools to guide the story that direction).
The line about "it's every knight's immutable destiny" is important, though: this is the end every player should be playing toward having happen, and it's the responsibility of every player to see that it happens. That player buy-in is really key. If they don't want to see a Knight's tragic downfall, they should probably play another game.