You imbue the longswords with limited sentience, causing them to float around you in a 10-foot-radius sphere. When a creature enters the area for the first time on a turn or starts it's turn there, it must succeed a Dexterity saving throw or take 7d8 slashing damage. Additionally, on your turn, you may use your action to cause the swords to attack up to 7 creatures in the area. Make a spell attack roll against each target; on a hit, deal slashing damage equal to 1d8 + your spellcasting modifier.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the number of creatures you can target as an action on your turn increases by one for each slot above 4th, provided that you supply an additional longsword for each target.