Walkthrough tips, Discussion of Campaigns [Heroes 5]

In reality, the fastest way is to spend 2-3 days running around the surface, recruiting elves, then quickly capture an Inferno castle, build up to 6 Cave Lords, and rush to the decisive castle through the undead dragons. The mission can be completed in about 40 minutes with a hero.

And really, what's the point of leveling up Agrael to level 30 if we won't see him again?