Discord

This spell assaults minds, spawning anger, irritation, paranoia, mistrust, and hatred. Each creature in a 10-foot radius Sphere centered on a point you choose within range must make a Wisdom saving throw. Undead and Constructs automatically succeed on the save, and creatures that are immune to the Charmed condition have Advantage. 

On a failed save, Friendly and Indifferent creatures become Hostile. An affected target becomes aggressive with surrounding creatures, either verbally or physically. If they are prone to violence, they may attack. Each time an affected target inflicts damage to another creature that is normally a friend or an ally, it can repeat the Wisdom saving throw. On a success, the effect ends for that creature.

Using a Higher-Level Spell Slot. The Sphere's radius increases by 5 feet for each slot level above 2 (maximum 30-foot radius). If you cast this spell using a level 5+ spell slot, each creature that fails its saving throw automatically attacks the nearest creature on its next turn.

Homebrew spell