Game is hard

[atlatea]

You're welcome.

I forgot something.

You should begin getting grand strategy medal from the very begining of the game, yep, even in the training offered by the king's knight in front of his castle you must already do a no loss till you get grand strategy medal 2. To do this, in case you do not know, just dump all your units to the castle garison, you'll be given paladin unit for free, just use this till you finished the training.

And in the begining, it's much easier to use 4 inquisitor split to 4 stacks, yep i mean using four 1 inquisitor, this will allow your pet dragon to lv up quicker than bringing full forces and easier no loss game. This stage of the game is also the best stage to get the increase damage to inquisitor and paladin medal, if you encounter enemy with ranged unit, kill most of them and left very few ranged unit, and then as you already know, keep using heal till you reach round 10. And don't forget to dig treasure chest. Don't worry to run out of mana, you have mana accelerator from pet dragon and four 1 inquisitor as rage gatherer.

Forgot to mention it, the best pet dragon is the blue one, reason? he/she has +1 initiative bonus.

Use that setup till most of enemies left there are not killable with that setup for no loss. Then switch to using full troops. Royal thorn, orc tracker and three 1 inquisitor is a good start, then you can add royal snake. As for hero battle, you need to finish them very quickly before they do nasty damage with their magic, maybe you need to use full 5 stacks of unit to finish them asap, just do what you deem best.