As with all Mass Effect titles, there is always a good and bad ending. In the case of Mass Effect 3, there are several of them and what you get will be based on the decisions you’ve made in the past via an imported save or going through the game’s default events.
Be warned that this article contains heavy spoilers as all possible endings of Mass Effect 3 are detailed. Be sure that when you read this, you have finished the game completely and working on a second playthrough to see more of the game’s endings. Okay, let’s start.
What You Must Know…
One of the key factors that will affect your ending, is whether or not you saved or destroyed the Collector’s Base from Mass Effect 2. If you didn’t import a saved data from Mass Effect 2 onto your Mass Effect 3 playthrough, then the Collector’s Base was destroyed. However, if you imported the save data and chose to save the Collector’s Base, you’ll somehow get a different ending from when you destroyed the Collector’s Base.
Another factor that will affect the outcome, is the final battle against the reaper and the Readiness Rating that you get. The Readiness Rating is the overall war assets you’ve collected, while playing through the game. You can see your War Assets on the Normandy. One of the ways to increase the readiness ratings is for you to play the multiplayer a lot and contribute to the Reaper Threat agenda. While that’s the only way to increase your chances in getting possibly the best ending, you will have to wait for Bioware to release more information on how to do it.