I decided to make Zohla and Izalia mentally tied together so tightly in the Force that if they’re together they slowly stop being individuals. Create a conflict between their bond and their desire to be their own people
They’ve been together their whole lives but not being twins, their bond in the Force confuses people, Jedi and Sith alike. The Overseers, at least the more esoteric, took it as confirmation of their destiny. The Jedi saw it as a gift from the Force to be managed and attempted to understand it and help the girls control it by separating them as soon as they were padawans and making sure they trained very differently. But the bond seemed to continue to flow rather then loosening it’s grip. The girls spent more then a few hours meditating with their masters and masters of the order in an attempt to understand the way they were intertwined.
One of the few who can use it against them is Valkorian who figures out that hurting them mentally, doubles the pain and exhaustion for both, and while one could fight him off, both of them feeling everything twice as strong, they can’t fight that. Or at least they didn’t yet know how. He tries using this to take them down, get rid of Zohla and take over Izalia. He only succeeds in step one, the others are tougher.