Sorcerer

Sorcerer: Metamagic

From 5th level, you know two metamagic options. You know three option at 10th level and four option at 17th level.

Whenever you finish a long rest, you can replace any metamagic option you know with another metamagic option.

Metamagic

Widened Spell

When you cast a spell that that creates a burst, a cone, or a sphere, you can spend a number of sorcery points equal to the level of the spell to double the measures of that area (e.g. a 10-foot burst becomes a 20-foot burst, a 15-foot cone becomes a 30-foot cone, a 20-foot-radius sphere becomes a 40-foot-radius sphere).