How to Get Proving Grounds in XCOM 2
To get the Proving Grounds in XCOM 2, just build it in an empty facility slot! You'll need an Engineer, 175 Supplies, and 5 Power. Go get those experimental goodies!
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Build the Proving Grounds in an empty Avenger slot. Gather 175 Supplies and an Engineer. You'll be crafting experimental stuff in no time.
I had to scrap together 175 Supplies and an extra Engineer, but once I built the Proving Grounds, it was all about those sweet experimental weapons!
Engineer + 175 Supplies + 5 Power. Boom! Proving Grounds built.
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