Trinity Pact

The Trinity Pact was a pact between Uranus, Neptune and Pluto, agreeing to defend eachother and the kuiper belt from the influence of the oort cloud. Together they formed the Sentinels, elite soldiers who could defend. At times the Keystones would also contribute to the defense. Pluto's contributions are often forgotten, but are important. Later on other dwarf planets joined as well, though during the early days there was conflicts surrounding the presence of the Neptunian empress and keystone, and there was at least one attempt on her life.