A possible plot like this could work out
If Lux is facing systematic prosecution, harassment, subjugation and potential imprisonment for being someone who is born with magical ability, I think Garen should send her to Mount Targon and have his buddy Taric look after her for the time being, I think she will be safe there and won't be hunted down by Demacian anti-magic enforcers. I also think that Sylas and other mages should be freed but in the meantime he should send his sister off somewhere safe. Those anti-mage Demacian police kinda remind me of gestapo. Props to the lore team for showing the darkside of Demacia.