Metamagic: Careful Spell is a Sorcerer feature gained at level 3 in D&D 5e. When you cast a spell that forces other creatures to make a saving throw, you can protect some of those creatures from the spell's full force.
When you cast a spell that forces other creatures to make a saving throw, you can protect some of those creatures from the spell's full force. To do so, you spend 1 sorcery point and choose a number of those creatures up to your Charisma modifier (minimum of one creature). A chosen creature automatically succeeds on its saving throw against the spell.