In the Hear of the Volcano

The quest will be assigned automatically, or in the eastern part of the cave. Move along the corridor, and after a while, you reach the first outpost, defended by many knights and wizards. We recommend that you attack them from a distance, or trying to "stir up" of specific enemies and lead them to your location, so you can delete them. Better to avoid fighting multiple opponents at once, your death would be likely.
Killed all the enemies, make your way to the room of the Troll. This is a great opponent and fast, you have to attack from close range to be able to inflict significant damage - a good general method is to run dodging all his shots, then making fast counterattacks, repeating this tactic until the killing of ' opponent. In subsequent parts of the cave, you will find mostly other trolls, wizards and knights in large part. Remove immediately weaker opponents, then begin to fight with beasts bigger.
Continuing your steps, dodging traps, paying particular attention to the crystals and small volcanoes. Finally you reach the prison Ethorn IV, a simple cell. Talk to him for a while, then continue with your adventure. Beyond the last room, full of traps, you get to the room containing the Archdemon. It has a certain amount of attacks - normal, this being the final boss. Teleport often along the pillars, by firing magic bullets - you will have to try to dodge them. Often times it will move vertically, causing harmful "waves" crash at other times short-range attack you, or summon other enemies like skeletons or spiders. Attack them only if they attack you first, in all other cases it will be best avoided.
In addition to continuous motion, you should - at variance with what was seen for the previous boss - a heavily offensive. You are now at the end of the game (or at least of this expansion), so it is necessary to conserve power to remove the rest of the subjects. His death will automatically complete two quests: "In the heart of the Volcano" and "Ashes Argaan over."