While it's still very early in development - hence the rough edges - there's still a ton of promise to be found in Stillalive Studio's Son of Nor.
Looking like an Avatar game in everything but the, um, official license, players use the terrain and the elements as their weapons, shifting the landscape and creating elemental forces to beat the snot out of their enemies.
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Despite what you see in the trailer up top, it's actually an action RPG, which allows for up to four-player co-op.
Son of Nor [Stillalive]