Quipping Expertise

You have expertise in quipping and making snide remarks at your enemy's expense, gaining the following benefits:

• You learn the vicious mockery cantrip. Charisma is your spellcasting ability for it.
• When a creature you can see within 30 feet of you fails an ability check, saving throw or misses an attack roll you can use a reaction to cast vicious mockery on them.
• In addition to the usual effects, when a creature fails its saving throw against a cast of your vicious mockery it is granted a -2 penalty to any other saving throws made against vicious mockery cast from any source, until the end of your next turn.