Anyway, thought of another simple battlefield.
White Sorbet
Contestants fight on an iceberg roughly the size of a town, drifting over the ocean to god knows where. The iceberg itself is made of normal ice, though it does have an occupant, namely, a rather unfortunate polar bear. The iceberg is uneven, though generally speaking, the closer to the center, the higher the elevation. The Ice, when gone, is gone for good. Hope contestants don't need solid ground to fight, as the nearest solid land is miles away, and the water is very deep. The weather is wonky, as daytime is always sunny with nary a cloud, and nighttime is always a stormy blizzard. The ocean and sky are otherwise normal, and includes materials and lifeforms normally found there. Contestants start from opposite ends of the iceberg.
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Aww, I lost to SuperNiceDog, Winner of the Rivalry Rumble Guru Contest