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Fable's old lore was that he was once a young kid (like 14) who developed a gambling addiction through a game that a Hag played with him, this gambling addiction evolved into a major issue but also he kept getting rewarded

Essentially, (at its worst) he would trade a chance at the Hag owning his soul for riches and status (basically russian roulette). In my world, Hags are reality-benders and can weave the strings of fate, so he received "payouts" like immense wealth and becoming the leader of a special organization of knights that he admired

He eventually lost one of these bets and therefore lost ownership of his soul, landing him trapped as the soul powering a magic tome. Also he was literally trapped inside this tome

Later, one of the protagonists (Riden, who is a servant of the Hag) detects that there is a life within this book and manages to pull him out using his fucked up and evil magic, after which Fable arms himself with the Hag's collection and "kills" her

Even later, he mysteriously goes insane and is killed by Riden and the other protag, Saga, when he tries to harm them

some reasons I want to replace them are that I hate him and he's edging the story too close to yaoi territory. if i replace him with a woman(-ish person) then it cant be yaoi but it can be yuri