Artijar’s Dolorous Bells

A ghastly image of a giant bell appears and begins ringing anywhere within range. Any creature of your choice that is within 30 feet of the bell and can hear it must make a DC 13 wisdom saving throw or become frightened of you. From a 30 by 30 foot radius of the bell 2d4 ghastly spirits emerge from the ground. Each spirit is under your command. The spirits have a fly speed of 60 feet. The spirits are small undead. You can only command the spirits to move, disappear, or attack. A spirit screams at 1 creature within range. This creature must make a DC 13 constitution saving throw or become prone, deafened for 1 minute, and take 1d4 necrotic damage. The spirits disappear if they take any amount of damage or the duration ends. You can command up to 3 spirits as a bonus action on your turn but no more.