Riot has been trying to come up with a new W for Fizz since the last League of Legends PBE patch cycle, when the design team tried out a new two-cast basic attack reset. That ability added a ton of burst damage to Fizz's kit, but it didn't ultimately make the cut, and Riot is back to the drawing board.
For this PBE cycle, he's got another W. This one doesn't promote bursting damage quite as much as sustained, on-hit damage, and that may be enough to incentivize Fizz players to build attack speed.
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