Cordon of Arrows

{e}{t}, 4+ arrows/bolts: You plant 4 pieces of
nonmagical ammunition in the ground to protect
an area. Whenever a creature other than you
comes within 30ft of the pieces for the 1st time a
turn or ends its turn there, 1 piece flies up to
strike it. The creature must make a DEX save or
take 1d6 piercing DMG. The piece is destroyed.
The spell ends when no more remains. At cast,
you can choose any creatures, and it ignores them.
———{line}{line}{line}{line}{line}{line}{line}{line}{line