Demon-Snaring Blade

Speaking phrases in an ancient language, you bind a precious gemstone, iron, and clay into a small blade, blessing it with holy water. This blade has the same stats as a dagger. When this blade is successfully used to attack a creature of evil alignment, it lodges into the skin of the creature. Each turn, the creature can use an action to make a Strength saving throw to remove the blade. Until the spell is either dispelled or blade is removed or destroyed, the afflicted creature has a movement speed of 0, and disadvantage on all Dexterity rolls.