Anti Magic Arrows

Not to be confused with Magic Piercing Arrows.
  These arrows have been specially crafted to create an anti magic field on impact.
  When you hit an enemy with one of these arrows they become encased in an anti magic field for 1d4 turns.
If you miss the attack but don't critically miss the effect is created on the tile, allowing a creature to step out of it. If you critically miss then the effect doesn't form in any meaningful way.
The anti magic field disables all except the most powerful of magics inside the field and prevents magical effects from entering the field or being created inside the field. This takes the form of a 5ft radius sphere centered on the target (or the tile). Magic items lose their properties, anything lose their ability to create magical effects including innate magical effects, magic that is influencing a creature is disabled for the duration. If someone that is concentrating on a spell or other magical effect steps into the anti magic field they immediately lose their concentration.
  Note that not all "unnatural" effects are magical and thus may still function in an antimagic field.
  It is used in the It is used in the Lost Mines of Phandelver and beyond campaign.