Avatar of the Void | Mission 4: A Dream Which Was Something More - main quests Heroes VI - Shades of Darkness Guide
Last update: 11 May 2016
Objective: head through the middle ghost gate and destroy the Avatar of the Void
The last mission. Before beginning it, be sure to visit all locations on the map and wear proper equipment: you should mainly focus on increasing your attack power. In case you lack proper artefacts, you can always visit the Dragon Utopia (M2, 18) and hope for some luck. Save your game and enter the portal (M2, P3) - the final battle will begin.
You have a predefined army in this battle. The enemy has lots of health and a few powerful skills which let him damage your enemy and heal himself as well. Additionally he ignores the first attack against him in any given turn. You should begin the fight by casting mass stand your ground and moving your units closer to the Avatar. Keeping in mind that the first attacks won't hurt him, you have a choice of attacking with the hero or Phoenixes - they don't deal too much damage, so you can use them to take off the enemy's barrier. Now you can send the rest of your army and hit the enemy to reduce his health. If possible, try gathering as many units around the enemy so that they can attack while avoiding the force field.
The enemy has a few skills. His basic attack deals damage and pushes back your units - it's not very dangerous. He can create Void Breaches, which remain on the battlefield for a couple turns and damage your units - it's best to move away to avoid damage. The third and last skill is Void Circle: it lowers ranged damage by 10% and heals 8% of health of the Avatar each turn. The best way to fight the boss is using pure brutal strength - you have to deal more damage than the enemy is able to recover. If your hero has a high enough attack ratio and you remember about destroying the barrier with the first attack, you should be fine.
Unfortunately the fight is rather difficult and much depends on how often the enemy will use Void Circle. Your strongest creatures are Black Dragons and Sacred Kirins, so you should cast heroism or mass heroism and heroic charge from time to time (assuming a different unit will take off the barrier). It's also possible that you will have to approach the fight a few times. Good luck!