Hidden achievement: Order from Chaos

What is the Chaos Beast?
The Chaos Beast is an enemy which will ambush you once your chaos level is at it’s maximum. The Chaos Beast is at least level 2 and scales with your heroes if you encounter it later in the game. Defeating it isn’t easy since most of its attacks will stun you, giving it multiple opportunities to attack you.

How to defeat the Chaos Beast?
If you are just scraping up the last achievements and don’t care about the way you kill this enemy, then I’d suggest loading up a new adventure of the “For the King” campaign and setting the chaos frequency to its maximum. Taking a monk to heal your team during the encounter will help greatly. Try levelling up your heroes by killing as many level 0 encounters as possible before max. chaos hits, getting the nearby statue and devoting yourself to the nearby sanctum. Once the chaos level is almost at its maximum, heal up all your heroes and make sure they are grouped together. If your heroes aren’t together, the Chaos Beast will attack them one by one which makes him quite deathly, especially early game. Get ambushed by having your heroes walk around the same couple of tiles, never leaving a hero far apart from the others.

If you want to defeat the Chaos Beast late game, be sure to equip yourself with some stun immunity items. Also having your heroes healed up and grouped together still applies here.

Good luck on your journey, heroes.