Allistair's Flock of Familiars

You summon a horde of familiars that circle around you and protect you from harm.

Any creatures of your choice within 20 feet of you must make a Constitution saving throw or take 4d8 necrotic damage as they are harried by them whenever they start their turn within the range or enter it for the first time.

Whenever a creature attempts to attack you, it must make a wisdom saving throw or else the familiars prevent the creature from attacking you, if they fail, the enemy must choose a new target or the attack is lost.

 At higher levels: When you cast the spell at any level above 4th, the damage increased by 2d8 for each level above 2nd.