the game world remains reasonably similar from day to day, changes have been made over time. Seasonal events that reflect on real world events such as Oktoberfest (as Brewfest), Halloween (as Hallow's End), Christmas (as Winter Veil), Children's Week, Easter (as Noblegarden) and Midsummer run for a period of a day or two up to several weeks. More regular events such as a fishing tournament have also been set up for players to take part in. Other changes include adding weather effects such as rain, snow and dust storms to areas, or redeveloping areas of the game in order to add new quests or to continue a particular storyline in the game. This can also include adding new dungeons to locations for the players to explore. Questing A large amount of World of Warcraft revolves around questing. These tasks or missions are usually available from non-player characters (NPCs). Quests usually reward the player with experience points and in-game money that the character can then spend on buying new skills and equipment. Some quests offer a selection of quest rewards, allowing the player to choose what would suit his or her character best. It is also through the use of quests that much of the game's story is told, with NPCs sometimes performing a small routine once a quest is handed in. Sometimes, quests of this nature are linked together by a common theme. Where one quest ends, another starts, forming a quest chain. A unique aspect of World of Warcraft is the use of a "rested bonus" system, increasing the rate that a character can gain experience points after the player has spent time away from the game. Quests commonly involve killing a number of creatures, gathering a certain number of resources, finding a difficult to locate object, or delivering an item from one place to another. During this process, a character may get attacked and killed by a creature, becoming a ghost at a nearby graveyard. 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. If this location is unreachable, they can use a special NPC known as a spirit healer to resurrect at the graveyard, although Blizzard has had the foresight to automatically resurrect characters in some such cases. When a character dies the items being carried degrade, requiring in-game money and