
Originally Posted by
Teah_Kaye
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My understanding is that the dome was part of what was merged, it's the protective bubble surrounding the keep. Not a result of the merging process.
I just rewatched some cutscenes, and this is correct.
Sphene says to Krile (early in zone 5, at the outskirts) that the dome existed in her world for hundreds of years before the interdimensional fusion - it's something Alexandria purposely created to protect themselves from the disaster that hit their continent. When the two worlds fused, they brought the dome with them.
This does raise the question of why they don't just turn the dome off once they realize they're not in Lightning Hell any more - but then again, their entire society is powered by lightning energy, so maybe Solution Nine would grind to a halt if they changed the weather back to normal?