Ice Arrow (5e Equipment)
From D&D Wiki
Weapon (arrow), uncommon
This magic arrow is has a jagged arrowhead formed with a semitransparent pale blue material, reminiscent of ice. Once this arrow is drawn, you can use your bonus action to focus on the arrow, causing it to glow with icy evocation magic. If you make a ranged weapon attack with this glowing arrow before the start of your next turn, the attack deals magical cold damage instead of its normal damage type. If the hit target is a creature, it must succeed on a DC 13 Constitution saving throw or be frozen solid, effectively petrified, until the end of its next turn. If the target has resistance or immunity to cold damage, it automatically succeeds on this saving throw. If the target takes any fire damage while petrified in this manner, the conditions ends.
Once it hits a target, this arrow is no longer magical.
You can expend 1 magic point when you use the bonus action to cause the attack deal an extra 1d6 cold damage. If you have the Spellcasting feature when you do this, the DC becomes equal to your spell save DC if it would otherwise be lower.