The Audhulma: Blade of Crystal and Ice

Audhulma
+5 Longsword
Requires Attunement
Damage:1d10+5, 2d6+5 versatile
Enemy makes Consitution saving throw equal to Player's Total Levels/2 + 10 + Charisma Modifier: On failure, They take 1d8 of cold damage each round. This damage overcomes resistance and immunity to cold damage.
Fatal Bloom: Perform a number of AoE strikes equal to your number of attacks, in a 50 ft radius, dealing damage equal to a number of d6's equal to your level.
Freezing Shower: Freezing shower deals 2d8s of cold damage for each of the player's total levels, and freezes the ground of the area ins a 100 ft radius, marking the area as difficult terrain for the player's enemies and easy terrain for their allies, meaning movement for friendly units is doubled. The enemy makes a constitution save equal to the players total levels/2 + 10 + Charisma modifier. Upon a successful save, they receive only half damage. This attack ignores the evasion ability.
Winter's Oblivion: Locked
Instant Hellfreeze: Locked
Absolute Zero: Locked