The first Offline Tournaments for Heroes 5!

Of course, you can finish very early, but, well, I couldn't – you can only reach the northern right Castle by defeating the emerald dragons, and the left one – by defeating phoenixes or elementals. By the time I had enough strength, the enemy came to me, and I had to wander around, wasting a lot of time.
By the way, save uploading will end today, please unlock the walkthrough thread for this mission.