Can’t find the answer
I assume you get a new lv1 5 star hero. And lose all emblems if they had them? But probably not a good move…
You will find the answer in the Hero Academy thread.
Yes… correct… but not guaranteed new in your roster, maybe a dup, but guaranteed not the same with the retrainer hero, so if you put Gravemaker+20, you will guaranteed not getting Gravemaker lvl 1.