How many worlds were directly involved, or victimized and utterly conquered in the “final” push for galactic conquest? How many were fully destroyed?

Both many thousands of worlds were conquered and many thousands more destroyed by the predations of the current members of the Extraterrestrial Alliance singly or in collaboration. This has been a lengthy and quite sordid saga of depredation and depravity, with the darkening of these extraterrestrial races through corruption with evil substituting and filling the void left by the spiritual disconnection all races underwent over time. This has allowed evil to reign over the entirety of the galaxy within the physical realm that it represents. There are beings currently in higher dimensions who, in effect, have graduated from physical existence and enjoy a safe harbor for the time being because they are, in effect, sequestered energetically and more aligned with the divine realm, which also is off-limits to all physical beings. These limits of physical existence, despite advanced technology, provide a containment for the physical beings so they can only influence one another but cannot traverse higher planes of existence. They can roam the physical dimensions and some interdimensional extensions of the physical realm but this is quite limited and rigidly enforced by Creator to protect the rest of the universe from the forces of evil that reign within your galaxy.