Prontera Castle is a prominent landmark in the game Ragnarok Online. It serves as the capital of the Prontera kingdom and is known for its grand architecture and central role in the game's storyline. The castle is surrounded by a bustling city, where players can interact with various non-player characters (NPCs) and access essential services. Inside Prontera Castle, players can find important facilities such as the King's Room and the Royal Guard. The castle also hosts various events and quests, making it a key location for players seeking adventure and rewards. Its historical significance adds depth to the game's lore.