At the end of Mass Effect 2 you have the option of either
destroying the Collector base or preserving the base to allow Cerberus to study it.
What effect on Mass Effect 3 (if any) does this decision have?
Mass-effect – What effect does the ending of Mass Effect 2 have on Mass Effect 3
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Best Answer
Saving the base gives you 110 points towards your Galaxy at War score compared to 100 for destroying it.
There is a rumour that the Illusive Man will be friendlier towards you in ME3 if you went his way in ME2 (saving the base) but that's unsubstantiated.
The endings below 1750 or above 2800 effective military strength are the same, regardless of what you chose to do in ME2.
The endings, organized by rating required are different depending on what path you chose:
Low EMS Option
Saved the base:
Destroyed the base:
Mid range EMS Option
Saved the base:
Destroyed the base:
Saved the base only option
High EMS Option
Saved the Base:
Destroyed the Base: