HwKeeper
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Ideally, of course, all these cards and making a skill wheel out of them in the heroes 5 section.
I've implemented skill display on class pages and an additional wheel mode where you can plan a hero's progression.
I haven't found the skill chance tables in the original Heroes, I don't know if they exist there, but for the expansions and 5.5 they do exist, so for those the chances are displayed.