HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

The fact that water artifacts reduce the imbalance of utopias is news to me.

I was just about to write
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Added 3 minutes later
So, with water artifacts, one player has a Teapot and a Kettle, while the other has a Captain's Hat and Boots of Levitation. I wonder, if these artifacts didn't exist, how would one imagine the imbalance?