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I have only played 3 mmorpg games; WoW, Aion and Age of Conan.
In most games your spells and abilities cost something like mana. In WoW you have great 'power sources', Mana, rage, energy and runes. I think this works great and makes the game play a lot more fun and different.
What do other MMORPG's have for power sources except for Mana and how do they work?
And do you have an idea of a power source that you think would work?