PoB: https://pobb.in/002vvpSm0i24

You can pretty easily reach above 10 metres Aoe on Ice nova with a combination of the Inc. Area of effect per Power charge charms.

This is a pretty memey build but I did my best to make it playable, even though it cost far more than it plays as. You could get even more AoE by using an enhance instead of a damage link for Ice Nova and being a witch. That would push you over 10 metres aoe.

Hidden beneath that is actually a decent that with Cold Snap of Power. With that much aoe your 5 areas from awakened Spell cascade actually overlap which leads to some very respectable damage output.

https://youtu.be/ZkL9zUMbwtw Video of Cold Snap of Power