- Corrosive Rounds are now buildable in Engineering only after finishing their associated Proving Grounds Project.

- The Corrosive Rounds Project requires Hybrid Materials Research and the Bio MEC Breakdown (additional configs to use Andromedon if you don't have Bio Division are included) plus 20 Supplies, 2 Alien Alloys, 1 Elerium Core and 1 Bio MEC Wreck. You need 3 Scientists and 3 Engineers on staff. You get one Corrosive Rounds when you finish the project.

- Building Corrosive Rounds in Engineering costs 10 Supplies, 1 Alien Alloy, 1 Elerium Dust and 1 Bio MEC Wreck.