Path of the Gatekeeper

Your rage is acidic, brought on by the countless times people have thought themselves equal to you concerning your area of expertise. The unfortunate fake fans who lie in your wake will be corrected by sharp words and a crack to the skull.
As a gatekeeper, you've studied a few different subjects to an exhaustive extent. Anyone who enjoys these subjects casually, or in less detail than you, is the source of your corrosive, harsh anger.

Snappy Comeback

Starting at 3rd level, your dismissive insults begin to truly sting. As a reaction, after being hit by an attack, you can cast vicious mockery on your assailant. Your spellcasting ability for this feature is Intelligence, and your Spell Save DC is 8 + your Intelligence modifier + your proficiency bonus.

Bullish Confidence

At 6th, your expertise in your subjects of choice hardens your impenetrable ego. Once per long rest, if you fail an Intelligence or Wisdom saving throw while raging, you can choose to succeed instead.

Um, Actually

Starting at 10th level, your insistence on minute details starts to stun the people around you. As an action, choose one creature you can see within 30 feet of you. If it can see or hear you, it must succeed on a Wisdom saving throw (DC equal to 8 + your proficiency bonus + your Intelligence modifier) or be stunned until the end of your next turn.

If the creature succeeds on its saving throw, it's immune to the effect for 24 hours.

Higher Standard

At 14th level, your gatekeeping has been honed to the point where you can even forcefully correct those who stand above you. While you're raging, you can use a bonus action on your turn to knock a creature one size category larger than you or smaller prone when you hit it with a melee weapon attack.