"Empower your next spell, making all of its damage dice rolls count as minimum your Charisma modifier value. Rolls that are equal to it or higher still use their normal value".
So, if you are a Sorcerer with 16 Charisma (+3), use Empowered Spell on Burning Hands (3d6) and it rolls 2,1 and 4 on damage dices, it is counted as 3,3,4.
I dunno ... seems quite powerfull. O_o
I mean in PnP version i know this metamagic is supposed to save your ass if you roll badly ... but nothing prevents you from roll badly again, maybe even worse.

Its (or it was, while Hags hair was still working) nothing hard to get Charisma 20 during EA ... imagine you will allways roll 5 or 6 with spells that use 6 sided dices ...
It just seems quite powerfull ...
There should be some limitation to ballance it back in my opinion, like 1 Sorcery point per 2 dices, or something like that.
They also should concider incerase chance to proc Magic Surge from Tides of Chaos to 100% ... or at least 80%+, or something high ...
The whole point of Wild Magic Sorcerer is that if you want to ... you can bring some SERIOUS chaos to the battlefield. :3
And i say let us!
