How did you beat chapter 6 and 7??
Both of these chapters are very fun and challenging to play, which makes this campaign the way it is.
In chapter 6, make sure to occupy two gold mines to the west of your main base. Set up towers and a few heavy troops with a few Warlocks to help them with their great set of spells. Completing the Sudden Change quest is impossible here, so after many tries, I gave up trying to beat it. Maybe it is doable with troops instead of heroes, but by this point I didn't even want to complete it. Instead, I only focused on occupying the gold mines and defending my bases until timer ran out.
Chapter 7 is a tough one in the beginning. You are required to play very fast in the beginning in order to destroy the first Castle of the humans in front of your base (the light blue human base).
Before you start doing all the setup, I strongly recommend you slow down the game speed, so that you can have more time to point your troops towards the task they need to do.
First of all, you are required to have at least 3 dragons for a successful attack, at least two Warlocks with all spells researched and at least two Demolishers to help Dragons snipe the Castle. You have one Dragon in the beginning, you need to train two more. At the same time, you need Peons to construct a few more buildings, such as Spirit Lounge, two Burrows and two War Mills (one goes to the left, beside trees, one goes to beside trees close to the Dragon Roost). At the same time, try to manage your hero items - sell items that you don't need for gold (you're going to need gold in the beginning, as early investment is expensive). After that, attack the two bandit locations that are near your base with your heroes. They're very weak so they'll be very easy to beat, plus they give some amount of gold and a Staff of Negation (you're really going to need this item to use on both your units and enemy troops, as the enemy has a lot of buff and debuff spellcasters such as Priests (Inner Fire) and Sorceress (Slow)). After you kill the bandits, raise them with your Death Knight hero. You need to get used to raising enemy troops, as this will be your main strike force that will always follow your heroes and be used as a bulwark to your heroes. Be sure to train at least two Warlocks from your Spirit Lodge and research their spells from other Spirit Lodge that you've built, as you're going to need to use Unholy Frenzy on Dragons and your heroes, while at the same time you need to put Healing Wards on the ground. The enemy is ignoring your Healing Wards during the battle, so it's a big plus for you. At the same time, you need to use your War Mills to research additional troop attack / defence buffs. Focus on ranged troop attack and defend buffs, as you'll need to have as strong attack and survivability for your Demolishers and Dragons as possible for the first Castle. I don't recommend attacking with Grunts and other troops, as the enemy seems to be focused on killing them first, so it's a waste of resources. Assuming you've obtained the Sudden Change quest rewards up to this point from the previous chapters, except chapter 6, your heroes will be in great shape, especially Doomhammer, who could tank a lot of damage.
After you're done with the first human Castle, you'll have some room for breathing until Stromgarde and Lothar's troops arrive, so you'll be ready with your fully researched spells for your Ogre Magi, which will help you significantly with their Bloodlust attack buff. The rest of the human bases are easier, since the beginning is the hardest part.
I know it is very hard to achieve this, as you are required to do all this work at the same time, but it's the strategy I used to beat this and it's definitely doable. If you're finding this difficult to achieve, I can do a video about it and post it for you to see.
Approved
