Harpoon Master

You've learned how to use harpoons to maximum effect in combat. When you take this feat, you gain the following benefits:

• Increase your Strength or Dexterity score by 1, to a maximum of 20.
• Creatures you've hit with harpoons have their speed reduced by 15 feet until they've removed the harpoon.
• If a creature is concentrating on a spell and ends its turn while impaled by a harpoon you hit it with, it must succeed on a DC 10 Constitution saving throw to maintain concentration.