Mighty caster (5e Feat)

Prerequisites: The ability to cast a 1st level Spell.
Through practice and study, you develop a more efficient way to cast your spells:

When you cast a spell that deals damage, you can add your spellcasting ability modifier to the damage roll if you don't already. If the spell has multiple damage rolls, such as the eldritch blast cantrip, you add your spellcasting ability modifier to each damage roll.

When you cast a spell that allows a saving throw to take no or half damage from the spell, such as the fireball spell or the sacred flame cantrip, creatures have disadvantage on the saving throw.