Most end-game challenges

While a character can be played on its own, players can group with others to tackle more challenging content. Most end-game challenges are designed in a way that they can only be overcome while in a group. In this way,

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 character classes are used in specific roles within a group. World of Warcraft uses a "rested bonus" system, increasing the rate that a character can gain experience points after the player has spent time away from the game. When a character dies, it becomes a ghost—or wisp for Night Elf characters—at a nearby graveyard.

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 Characters can be resurrected by other characters that have the ability, or can self-resurrect by moving from the graveyard to the place where they died.