Shaman epic doesn't change how the class is played, but simply makes them more mana efficient because they have an extra way to do damage. looking at it that way, Torpor is more class defining than the epic is.
Bard epic literally changes how the class is played on a fundamental level, which was what the OP was asking. Other epics are more about making the classes a bit more powerful at what they already are able to do.
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