Is there a way to make changes in the DKP that are retroactive? Say I change the point value for killing a boss, or change an items value, can this be simply applied to all the previous raids where these events took place?

Ooh...never thought of that.

Changing the price of items can be done retroactive but not bosses at this point. I'll have to add that.

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The day Microsoft makes a product that doesn't suck is the day they make a vacuum cleaner.

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It's all in the reflexes.