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What solidifies Dumbledore's "Power" is not the spells or magic power he has. Which both possess a great deal of it. But it is strategy. Dumbledore knows the Strength and Weaknesses of all those he encounters. This allows him to manipulate/persuade people. While Voldemort uses fear as his source of control. Dumbledore often states that Voldemort's weakness is that he underestimates the power of love. Thus making him less powerful as he casts out any magic that is not related to a fear inducing power. Voldemort is in it for himself and has no alliances but onto himself.
@APaleShadow I have read once that Tolkien was facinated by a period of history in a particular culture's past, But I am not sure if that was anglosaxon or not. Some reference on seeing a big epic battle that either may have happened in England but the records were lost, or did not happen in England but feels like a missing part of history. I think this was from an AE documentary about tolkien in honor of the peter jackson movie LOTR.