Play as Inferno.

Well, read, for example, post number 4. There, I said that we play in late game, although I didn't specify exactly how late, before you shared your view on this problem. And in a normal late game, units are leveled up to at least 28; otherwise, it's more of a mid-game, meaning that the Stronghold can participate. The presence of a mentor isn't crucial here because we only level up units in the Stronghold.