Which version of WoW do you have? In the one I've been playing I have to reach a certain level to get certain spells and abilities or improvements on existing spells and abilities. Not only do I have to get the level, but I also have to buy it. The money isn't free, so I have to get that too. I would say that's earning the abilities. And they don't all have the same cost. Shadowbolt and Curse of Agony take different amounts of mana and have different casting times. So I really don't know what your complaining about
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Which version of WoW do you have? In the one I've been playing I have to reach a certain level to get certain spells and abilities or improvements on existing spells and abilities. Not only do I have to get the level, but I also have to buy it. The money isn't free, so I have to get that too. I would say that's earning the abilities. And they don't all have the same cost. Shadowbolt and Curse of Agony take different amounts of mana and have different casting times. So I really don't know what your complaining about