The Purqua Power Pact, or Purqua, was a three-way MDAP agreement between North Atlantic Treaty Organization, United Purple Nations, and Invicta. The treaty went into effect on 9 October 2007, less than two weeks after Invicta joined the Common Defense Treaty. It originally was the strongest treaty for UPN and Invicta, while NATO had similar pacts with seven other alliances. Purqua is an amalgam of Purple and Aqua, the native spheres of the signatory parties.