I think each MMORPG has own special feature for attracting more players. In Warhammer Online, it is called "Tome of Knowledge" (ToK), which is an extension upon similar mechanisms in many other MMOs. The ToK main effect is provides a great deal of information about the game world for the players. Actually, it is a multi-purpose reference tool that could give our players more help. It is also meant to serve as a reduction in the need for players to feel like they have to rely upon third-party sources of information pertaining to the game.
The Tome of Knowledge keeps track of all information pertaining to an individual character and their progress through the game. This progress unlocks lore-related information about quests, the gameworld itself, NPCs, and defeated mobs. For example, upon first encountering a mob within the game, a basic entry is added for that creature in the Bestiary chapter of the ToK. However, with increasing contact, kills, and associated activities involving any specific creature, the information available about those encounters will be added to the Tome of Knowledge. I don’t know whether players search the information like War Gold, how can I get more War gold and how can I do War leveling fast from ToK, I never try it. I am very curious that it has any answer to our players! Likewise, the ToK keeps track of the story and progression of the character through the gameworld as they complete quests, explore the map, and otherwise accomplish activities within the game.