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Joe,
It's a thorny problem for sure. Rather than a graphical "tree", personally I'd be happy with the current list form, but with some expanded functionality within the descriptions themselves. For example, having a clickable link to prereq abilities instead of just listing them in plain text, listing prereqs to the prereqs in some sort of indented or nested form, and maybe even listing any abilities the current one is a prereq for.
Just spitballing
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