Vasari returning fleet research
2nd level of final research item
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The very last vasari tech to get returning fleet - I believe it is called returning fleet - has two levels of research you can do for that item. Originally, I thought you had to research both levels to have returning fleet work, but it appears that you only need to research one. Then I thought the second level must reduce the antimatter cost to cast returning fleet, or cooldown time, etc. but it appears all of those stay the same.
What does it do?
What does it do?