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I've got trouble with it too, though it seems to happen to me all the time. This time...it feels different.
There's this entity called the Lord of Nightmares, from her dreamworld. There, she summoned it for a spell - was forced to, I should say, she was young and left with little choice - and it carried over to here. It was living within her, biding its time. It was why her hair turned white, it's an energy sucker, the thing was sucking up everything, and it's also why people's things were disappearing. It could have gotten worse so an exchange had to be made. She summoned it in that world, so she had to pay the price here.