Quote Originally Posted by Triscuitable View Post
Arrival is actually necessary to the ME3 canon.
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It begins with the trial Hackett informed Shepard about at the end of the DLC, under which charges were filed due to Shepard's actions during the DLC.
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Yeah, I know. Except there was apparently supposed to be a whole trial scene that ended up getting dropped. Then we got the awkwardly directed opening scene instead.