For Blood and Honor | Mission 3: The Quest of the Unknown - main quests Heroes VI - Shades of Darkness Guide

Objective: Reach the Crystal Lake Crystal Lake and defeat the Guard of Honor

Reward: 40000 EXP, Moonblade

Completing the previous mission ("Raiders of the Lost Tear") will open a gate at (M2, 7) and therefore the Guard of Honor will now constantly keep attack you. To take care of them, you should move the battlefield to the enemy's land. Collect all of your forces at Kakurega (M2, 1) and head north. One firm attack on the Naga city (M2, 8) will put an end to the Guard of Honor's attempts and let you freely explore the map. If you have troubles with defeating the enemy, you can complete the additional missions "The Nature of Portals", "Story of a Ghost" and "Secret of the Shadesteel" beforehand, as they will not only increase your army bit also let you recruit better units.