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Just a thought and shooting it out there but if Keyleth hadn't been able to get the Sun Tree to create that light to help break Cassandra and Vax out of Sylas control Vex and Percy might have been killed by their own siblings.
Keyleth at that saved both Cassandra and Vax from doing something they would have regretted in the end.
I always like to imagine what would happen if just one thing was different if one thing had happen in a scene. How that would change the outcome of the fight, of the entire arc? Would it began it's spiral down on a darker path or would the heroes find a way to prevail?
What do you all think?