Aurora's Rime (double-bladed scimitar)

Forged in blue flame these swords are said to hold the cold of Cania itself. You gain a +1 bonus to attack and damage rolls you make with this weapon. As a bonus action you can speak the sword’s command word and cause the blade to emit a deep chill, during this time the blade deals an extra 1d8 cold damage to the target. The deep chill lasts until you use a bonus action to speak the command word again or until you drop or sheathe the sword.

This blade has 6 charges. While holding it, you can use an action to expend one charge to cast the Frostbite spell from it. The DC is 15 and the sword regains 1d6+1 expended charges daily at dawn. 

The double-bladed scimitar is the signature weapon of Valenar elves. A haft of fine wood supports a long, curving blade on either end. Forged with techniques honed over centuries, these blades are strong, sharp, and remarkably light. Each scimitar is a masterpiece, and as a result the double-bladed scimitar is an expensive weapon (100 gp) — few though ever have the opportunity to purchase one. A Valenar blade in the hands of a non-elf is generally assumed to have been stolen or looted from a fallen foe, and a Valenar elf might feel entitled to demand its return or challenge the bearer to prove they’re worthy to wield it.

Special. If you attack with a double-bladed scimitar as part of the Attack action on your turn, you can use a bonus action immediately after to make a melee attack with it. This attack deals 1d4 slashing damage on a hit, instead of 2d4.

Notes: Bonus: Magic, Damage: Cold, Damage, Combat, Special, Two-Handed