World of Warcraft, wasn't Dalaran destroyed by Archimonde? Why are you in Northrend?

In the plot, Dalaran was not completely destroyed. When tribes and alliances marched into Northrend to fight natural disasters, Dalaran crossed the Jingge forest in Northrend.

Related introduction:

There is no doubt that the Blue Dragon Army led by Marigos has declared war on secular spellcasters all over the world. In order to cope with this crisis, Dalaran will be moved to the mid-air of Northrend keel wilderness.

There are signs that Ronin will become the leader of New Dalaran, because Jaina will stay in Saalamo and Khadga is now receiving an education from Adal in Saudi Arabia. In this way, Dalaran will become a major neutral city in Northrend, similar to Saudis in Outland.

Extended data

Dalaran is one of the earliest human city-states in Arazo. A long time ago, a committee of secret magicians named Qilinto supervised some unexpected mysterious events in this secret learning center from Violet Castle.

In the third war, the undead army swept the whole city, and then the commander of the Burning Legion, Archimonde, destroyed the whole city with his evil spell. A few months after the natural disaster abandoned the whole city, a group of wizards claimed their ownership. Now, a hemispherical magic dome covers the whole of Dalaran, protecting the city.

There is no magic or conventional method to detect what is happening inside this shield. Exorcists patrol around the protective wall, although the shield is powerful enough to destroy any creature that tries to get close to it.

Baidu encyclopedia-Dalaran