Allow for duplicates to change color of maxed heroes.
For example, if you have, say Ariel on max and Khagan 1/1, you can pay food and recruits and Khagan to make Ariel red. Stats and skill should stay the same.
If this is a HOTM, element link color should be replaced.
For example, a red Vela should give crit to reds, but other part of her special should not be changed (so, she will still do extra damage to reds).