Diablo II: Lord of Destruction is an expansion pack for the popular hack and slash action role-playing game Diablo II. Unlike the original Diablo’s expansion pack, Diablo: Hellfire, this is an official expansion designed by Blizzard North.

More than just a standard expansion, Lord of Destruction (LOD) not only added content in the form of new character classes and an additional scenario, it also dramatically revamped the gameplay of the existing Diablo II for solo and especially multiplayer. As a result, LOD is largely considered a "must-buy" instead of being just an add-on and this makes it one of the most successful expansion packs of all time. Also, this expansion has been a huge multiplayer success and is still being played.

The storyline picks up where Diablo II left off, with Baal now leading an invasion against the northern barbarian lands.His first attack, against the city of Sescheron, capital city of the Barbarian homelands, leads up to the stage where Diablo II: Lord of Destruction is set: Harrogath. Situated at the base of Mount Arreat, it’s home to the people who are sworn protectors of the mountain. Baal is currently besieging the city and destroying any settlements along the way up the mountain towards its summit. The hero stands tall, fighting the three Prime Evils, Mephisto, Diablo, and Baal.

Baal, the Lord of Destruction, is after the Worldstone, a massive crystal-rock of transcending energies, created to prevent the High Heavens and Burning Hells from consuming the mortal realm completely into their respective folds. It is the source of all the Soulstones and their powers, so Baal wishes to obtain it, corrupt it and complete his brothers’ plan to conquer the mortal realm and use it as a staging area to besiege the Heavens in the endless war between the two.