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She cleverly cheated in a duel against the blonde – she simply didn't level her up, and a champion at level 12 will somehow manage to defeat a champion at level 7, even if it's a struggle and doesn't happen on the first try. She'll just sit on the ship until I beat her three times, I can feel it.
And I also realized my mistake – I didn't raise her constitution to 12, so now no implant can be installed, I need to level it up manually (sad face).