EverQuest: Seeds of Destruction is the 15th expansion to the MMORPG EverQuest.
Mercenaries: Players can now hire player-controlled mercenaries to quest with.
Level cap increase to level 85.
New high level item sets, new Alternate Advancement ability lines, new spells, and new skill caps.
Over 20 new zones including Oceangreen, Bloody Kithicor, Field of Bone, Invasion of Earth, Kuua, and Discord
Source: Wikipedia, "EverQuest: Seeds of Destruction", available under the CC-BY-SA License.