How about a twofer? Let’s make this happen-a feat and a metamagic
Punish the Weak
You capitalize on hurting those who are already reeling. Gain the following:
- Increase one ability score by 1, to a maximum of 20.
- When you use an ability or spell that requires a saving throw and you would have advantage if you used a melee or ranged attack on the target, the target has disadvantage on the saving throw.
Second, the megamagic-a modified version of the heightened spell
When you cast a spell that forces a creature to make a saving throw to resist its effects and you would have advantage on attacking the target with a melee or ranged weapon, you can spend 1 sorcery points to give one target of the spell disadvantage on its first saving throw made against the spell.