Frostmourne Mission 11 | Chaos Damage Screenshot | Warcraft 3: Reign of Chaos

In mission 10 Arthas become insane an betray his men. It i a dark page, torn from the adventure book. And now it is time for him to do what exactly demons planet, to take the cursed sward of Frostmourne. After Arthas take the sward, his attack become chaos and not normal. Now its time to ride the Mal'Ganis base, and unfortunately for him, his master have double cross him, allowing Arthas to take his revenge.

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Trudging Trough the Ashes Mission 12 | Acolytes Screenshot | Warcraft 3: Reign of Chaos

After all his sins, Arthas become a Death Knight and take control of the Scourge. His first mission for the demons is to free some acolytes and begin building his new empire of Undead. Acolytes are the undead workers. They build buildings like the Protoss do, just spawning them and are free for a new job.

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Digging Up the Dead Mission 13 | Scourge Screenshot | Warcraft 3: Reign of Chaos

The Scourge buildings can be placed only on dead land, irradiated from the main building and the Ziggurats, which acts like farms and increase army limit. Undead do not have a separate building for towers, but the Ziggurats can be upgraded to towers, which is very handy. The Acolytes build building like Protoss, and the buildings are spread like the Zergs. Other than that, the acolytes can only harvest gold, the lumber is collected by the most simple combat unit. In mission 13, the Scourge advance to the lands of the High Elves.

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Into the Realm Eternal Mission 14 | Sylvanas Windrunner Screenshot | Warcraft 3: Reign of Chaos

The elves will try to stop the undead advance at the great gates, but they will fail. In mission 14 the Meat Wagon is available. It is the catapult unit for the Scourge and it can attack trees.

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Key of Three Moons Mission 15 | Crypt Fiend Screenshot | Warcraft 3: Reign of Chaos

To open the last gate to the high elves, Arthas need to obtain 3 Mooncrystals. First he need the Crypt Fiends ability to force flying units to the ground, then to establish a base and defend it from air and drop attacks, and then to use the Goblin Zeppelin to transport the troops to other continents.

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The Fall of Silvermoon Mission 16 | Gargoyle Screenshot | Warcraft 3: Reign of Chaos

This is the mission where the main stronghold of the high elves Silvermoon falls. But before that, Arthas need to stop some runners from the west, There he will find the Scourge first flying unit - the Gargoyle. The Gargoyles can attack either ground and flying units, they are pretty strong and have a special ability to turn to stone. When in stone form, they increase armor and regenerate health faster.

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Blackrock and Roll, Too Mission 17 | Frost Wyrm Screenshot | Warcraft 3: Reign of Chaos

In mission 17 Kel'Thuzad, the reborn Lich, need to speak with the mysterious demon lord, who have issued the plans so far. But to do that, the both heroes need to secure a demon gate to communicate with the lord. As the demon gates are favorite ground of orcs to play, they need to dispose of some orc champions. With the help of the Frost Wyrms, it should not be a problem. The Frost Wyrm is the strongest flying unit of the Scourge. It attacks both ground and flying units with a powerful damage, and can freeze buildings and towers.

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Blackrock and Roll, Too Mission 17 | Kel'Thuzad Screenshot | Warcraft 3: Reign of Chaos

Kel'Thuzad is the shaman responsible for the first horde invasion. When it is reborn as a lich in Silvermoon, he will fight along with Arthas from mission 17. He is week, his magics are not very useful and he will stay for a very short time.

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Blackrock and Roll, Too Mission 17 | Demon Gate Screenshot | Warcraft 3: Reign of Chaos

The demon gate is secured and the mysterious demon lord will reveal his further plans.

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The Siege of Dalaran Mission 18 | Fountain of Health Screenshot | Warcraft 3: Reign of Chaos

The Scourge is invading Dalaran human capital city. There the king's most powerful mages have created magic barriers, which harms the undead. To remove the barriers, Arthas and his lich advisor will have to dispose of 3 archmagies.  The first one is to the left before the barrier. Although the barrier harms the undead, it do not destroy them instantly, so they can move inside for a quick blow on the archmagi. Also, along the way, there are those Fountains of Health, which regenerate hit points faster to everyone around it.

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