Talk:Hero Crystal/@comment-5.13.198.179-20140814222506/@comment-25009284-20140814235127

"Each general is classified as one of three types: Balanced, Defensive , or Aggressive ."—General Types.

The matching Hero Potions are used to add in "free" EXP into the Hero EXP (not Player's). Meaning to say, they work as if you did some questing/battling/etc for EXP but you are not.

It is a similar concept of using Stamina/Energy potions (or even refills) to shorten the amount of waiting time—in this case, to "shorten" the EXP required to do a level-up.

That said, if you cannot level up a General anymore, you won't benefit anything at all by putting "excess" EXP into said General. Therefore, you would need to raise the level cap first.

As a side note, different General's tiers have different amount of Hero EXP required to do a level-up (at each level).