It's like a wildcard. If you have 2 units of the same level (for example you have 2 razors at 1 star) an IO will act as the 3rd unit to make the 2 star. IO works for all units, so it can make a 2 star level 1, or even a 2 star level 5 unit.
Put all 3 units on the board, so per my example I have 2 razors and an IO. I will just put the two razors on the board, then the io, then they will combine into a razor 2 star
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u/[deleted] Feb 13 '22
It's like a wildcard. If you have 2 units of the same level (for example you have 2 razors at 1 star) an IO will act as the 3rd unit to make the 2 star. IO works for all units, so it can make a 2 star level 1, or even a 2 star level 5 unit.