With the WoW expansion coming out soon we wanted to zero out our DKP system and start everyone back at zero.

I really don't want to apply 300 adjustments.. so is there an easier way to do this?

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The easiest way to clear a DKP history is to simply delete that DKP system. Clicking [Edit] next to the system, and then the delete button at the bottom of the subsequent form.

Alternatively, if you wish to keep the data for posterity, you can just create a new DKP system and use that one for the Wrath raiding.

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It's all in the reflexes.