Expansions
Expansions have been released regularly, all of which add new content in the form of landmass, art, quests, items, or game mechanics.
Ultima Online: The Second Age (October 1, 1998) featured a new area of land called the Lost Lands, along with an in-game chat system and new creatures. Also known as T2A. It was released in two boxed versions with the first having different artwork and a single manual.
Ultima Online: Renaissance (April 3, 2000) doubled the size of the world, as there were literally two copies of it. The worlds were called Felucca and Trammel, after the two moons in Ultima's Britannia world. The Trammel world did not allow player killing, while the Felucca world did. Felucca also adopted a darker, more foreboding look.
Ultima Online: Third Dawn (March 7, 2001) included a 3D client to compete with 3D competition like EverQuest. Also, a special Third Dawn only land was created, called Ilshenar. It was accessible only to 3D clients until the release of Lord Blackthorn's Revenge.
Ultima Online: Lord Blackthorn's Revenge (February 24, 2002) brought "a dark new world based on new characters from Todd McFarlane" to Ultima Online with improved game artificial intelligence, in-game help, and improved character creation.
Ultima Online: Age of Shadows (February 28, 2003) brought the landmass of Malas with space for new housing, two new character classes (Paladin and Necromancer) and the ability to customize house designs. The item system was completely reworked with this expansion. Armor resistance was split into five types of resistance, and many new properties that affected game play were added to weaponry. As good equipment became vital, this expansion also brought with it item insurance.
Ultima Online: Samurai Empire (November 2, 2004) brought ancient Japanese mythology and folklore to the game, two new classes (Ninja and Samurai) and a new area to explore, the Tokuno Islands. The new class skills shifted the balance of player vs. player combat away from mage dominance.
Ultima Online: Mondain's Legacy (August 30, 2005) introduced a new race, elves, and a new skill, spellweaving. Several dungeons were also added.
Ultima Online: Kingdom Reborn (June 27, 2007) introduced a new client with new graphics and interface.
Ultima Online: Stygian Abyss (TBA, originally planned for 2007) will feature a new playable race of Gargoyles and the largest dungeon in UO to date.