Empowered Spell
When you roll damage for a spell, you can spend 1 Sorcery Point to reroll a number of the damage dice up to your Charisma modifier (minimum of one), and you must use the new rolls.
You can use Empowered Spell even if you’ve already used a different Metamagic option during the casting of the spell.
Sources
Player’s Handbook (2024) p. 142. Available in the SRD