Lineage is a medieval fantasy, massively multiplayer online role-playing game (MMORPG) released in the United States in 1998 by the South Korean computer game developer NCsoft. It is the first game in the Lineage series. Lineage features 2D isometric-overhead graphics similar to those of Ultima Online and Diablo II. Players can choose one of seven character classes: Elf, Dark Elf, Knight, Prince, Magician, Dragon Knight, or Illusionist. Princes are the only class that can lead a blood pledge (which is Lineage's term for a guild or clan). Game play is based primarily upon a castle siege system which allows castle owners to set tax rates in neighboring cities and collect taxes on items purchased in stores within those cities. It features classic RPG elements reminiscent of Dungeons & Dragons, such as killing monsters and completing quests for loot and experience points, levels, character attributes (charisma, strength, wisdom, etc.), and alignments (neutral, chaotic or lawful). A character's alignment affects how monsters and town guards react to the player's character, often turning hostile to chaotic players and attacking on sight. Player versus player combat (also known as PVP) is extensive in Lineage. Players can engage in combat with other player characters at any time as long as they are not in safe zones such as cities. By joining a "bloodpledge" (an association of players similar to a clan in other games) players become eligible to engage in castle sieges or wars between bloodpledges.