EverQuest: Depths of Darkhollow (DoD) is the tenth expansion pack released for EverQuest, a massively multiplayer online role-playing game (MMORPG). It features monster missions, spirit shrouds, evolving items, new missions, new creatures, new zones, new items and more.
While certain aspects of this expansion can be enjoyed by characters of all levels, the new zones and missions are intended primarily for characters of level 45 and higher.
Monster missions: These will allow players to take missions, but playing as a high end monster instead of a player character. For example, a player might assume the role of 'Lord Nagafen' and repel a raid of NPCs who have come to slay the dragon lord for his rare treasures.
Spirit shrouds: These will allow anyone to take the form of a monster of lower or equal level, to hunt with their lower level friends in any zone. For example a player with a level 70 character could take on the form of a level 15 spider to hunt with their friends of the same level.
Evolving items: New types of items will be introduced in which, while equipped, will gain their own experience points and increase in level for better stats and function.
Source: Wikipedia, "EverQuest: Depths of Darkhollow", available under the CC-BY-SA License.