Board Thread:Questions and Answers/@comment-44858259-20200114022641/@comment-29799174-20200114125334

There is no point in leveling generals you don't use, except maybe to gain a tiny advantage in Invade? I assume general stats past level 1 or 4 are taken into account, but I don't know. But it's not like Invade is a big part of the game nowadays anyway.

I keep all my new generals I don't use at level 1, and if ever I get the "Level up your Hero!" task in a Hard Campaign and want to complete it I can just level up some of them to level 4 without using any Crystals.