I have a map somewhere that deals with that I think. I`ll post it as soon as I find it.
Edit: Oh, this map actually deals with attributes..
Anyway, Should work the same way. Use the "unit add behavior" action.
Let me know if it works.
The way I'd do it is to create a behavior (buff) that adds certain attributes. When the unit reaches level 10, the trigger applies the buff to the hero. You can hide the buff by selecting the "hidden" in Stats - Flags.
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