Aurelain of course but I never knew him personally. Good idea, having the skill to modify the skillwheel would be handy..
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H5 is still alive and kicking, join us in the Duel Map discord server!
Map also hosted on Moddb
You can make a new skillwheel using Javascript, HTML and CSS. I am pretty sure about that - the wheel on mmh7 offical site is written in those languages.