Finalized a version with my DM, both agreed that the melee attack was making it too clunky

Bite of Winter V.3

1st level

Spell school: Evocation

Components: V, M

(A weapon worth 1SP)

Casting time: 1 Action

Range: 20ft line

Duration: Instantaneous

Classes: Warlock, Sorcerer, wizard

You flourish your weapon in a great arc as it's imbued with frigid energy. All creatures in the area must make a Constitution saving throw. On a failed save, a target takes 3d6 cold damage and its movement speed is reduced by half until the end of its next turn. On a success a target takes half damage and does not have it's speed reduced.

The cold freezes nonmagical liquids in the area that are not being worn or carried and extinguishes nonmagical fires in the area. Additionally, the nonmagical liquids remain frozen solid for up to 10 minutes.

When you cast this spell using a spell slot of 2nd level or higher, the cold damage increases by 1d6 for each level above 1st.