Black Ice Blade

You weave together a sword of black ice in your hand. This magic sword lasts until the spell ends. It counts as a simple melee weapon with which you are proficient. It deals 2d8 Cold damage on a hit and has the finesse property. In addition, when you use the sword to attack a target during a snow storm, natural or otherwise, you gain advantage on the attack.

If you drop the weapon or are disarmed, it dissipates at the end of the turn. Thereafter, while the spell persists, you can use a bonus action to cause the sword to reappear in your hand.

At Higher Levels. When you cast this spell using a 3rd- or 4th-level spell slot, the damage increases to 3d8. When you cast it using a 5th- or 6th-level spell slot, the damage increases to 4d8. When you cast it using a spell slot of 7th level or higher, the damage increases to 5d8.