It was only difficult at the beginning! When the armies are small, and there are no resources for construction.
Therefore, you shouldn't build up, but run around the map with your heroes in different directions and gather armies!! I was on the verge of tears - that's why I had an additional task - "Recruit 40 Orcish units", and when I played as Blood, it was the opposite, "Kill 40 Naga units".
The most important thing is to find improved goblins and centaurs and BUY the "Emerald Bow of Yumi" or the "Unicorn Mane Bow" so that the goblins shoot with a direct arrow.
That's it!! You don't need to rush into the Dungeon to another island right away. Don't be afraid to clear the map, thereby getting stuck in one place for a long time. This is normal. Heroes jumping out from the depths will be annoying! BUT YES))))
The most unpleasant thing is that mage heroes will hit you with "General Healing". So, losses are inevitable....
I didn't fight the Water Dragon, I just gave him the chalice!)) But it's strange, when I talked to the Necromancers, Akamas appeared and said, "Cool fight"))
Now about the end of the mission!
SIT IN THE CASTLE!! DON'T GO ANYWHERE!!! Don't be alarmed that by the end of the mission, the underwater heroes of Sanctuary will take away all your forts, mines - everything!!! This is intentional, to lure you out!
Don't give in to provocations! Sit and build up your army!
There will be a total of four quest heroes. The army of each subsequent one will grow!
So, screenshots!
A built castle with the Grail: http://www.imageup.ru/img289/1246150/01.jpg
The first quest hero, Zhao:
http://www.imageup.ru/img289/1246151/02.jpg
The ability of the tearful warrior, "Strength against Magic": http://www.imageup.ru/img289/1246152/03.jpg
The moment of the attack of the "Panther Warriors": http://www.imageup.ru/img289/1246156/05.jpg
Mizu Kami takes damage from the "Panther Warriors": http://www.imageup.ru/img289/1246157/06.jpg
The second quest hero, Kalindra: http://www.imageup.ru/img289/1246158/07.jpg
Kalindra casts "General Healing": http://www.imageup.ru/img289/1246159/08.jpg
Losses after the battle with her: http://www.imageup.ru/img289/1246162/09.jpg
The third hero, Kenagi: http://www.imageup.ru/img289/1246166/16.jpg
And finally, his majesty, Mukao: http://www.imageup.ru/img289/1246163/10.jpg
The Panther Warriors, under the effect of "Reinforcement", ended up in the thick of the battle and took all the hits. Look how many positive and negative spells are on the unit))))): http://www.imageup.ru/img289/1246167/12.jpg
In my opinion, the moment is captured well - Crushers under "Water Shield" attack the "Sprites", and receive return damage, which activates the "Water Shield": http://www.imageup.ru/img289/1246172/13.jpg
Final losses: http://www.imageup.ru/img289/1246174/14_fight_mukao.jpg
Victory, level up: http://www.imageup.ru/img289/1246175/16_final.jpg
It's difficult, but possible! The level is good, it keeps you in suspense!
Good luck with the Walkthrough!