Diablo II: Lord of Destruction/New features

Differences from Diablo II
 * 1 Additional Act that continues the plot with 6 Quests
 * 1 Additional Mercenary available in Act V
 * Mecenaries can leave the act they were purchased in and are able to equip certain weapons and armor
 * Hardcore Mode
 * Maximum resolution of 800x600, default is still 640x480

Items

 * Charms
 * Runes and Runewords
 * Jewels
 * Elite Items
 * Ethereal Items
 * Increased stash space
 * Alternate main hand/off hand weapon slots for quick swapping and additional "storage" space
 * Class specific items
 * New unique and set items