Aika Online
AIKA Online is a free-to-play 3D fantasy massively multiplayer online role-playing game (MMORPG) featuring player vs. player (PvP) capabilities, over 1,000 quests, dungeon exploring, and crafting. The game was created and optimized for large-scale nation wars, where thousands of players could fight simultaneously, in the same place, in the most massive combat scenarios that MMORPGs have ever seen. The players had the option of fighting for control over their nations during a castle siege, attacking enemy nations to capture artifacts, or participating in a variety of PvP objectives in the battlegrounds.
While the original publisher no longer has the license for the game, it can still be downloaded and played, courtesy of Hanbitsoft.