Arrows of darkness

When you cast the Arrows of Darkness spell, you temporarily imbue your arrows with necrotic energy that manifests as tendrils of shadow and darkness. Each arrow fired within the duration of the spell is imbued with this energy and deals an additional 1d6 necrotic damage to its target on hit

Furthermore, for the duration of the spell, your arrows are treated as magical for the purpose of overcoming resistances and immunities.

The dark energy from the arrows also partially blinds the creature struck for the next 3 round, giving their next attack roll disadvantage.

The spell ends if you lose concentration for any reason or if the duration of the spell ends.

After target gets hit the concentration no longer matters.