Stygian Sheath

Spell Lists: Warlock, Sorcerer, Wizard
Evocation cantrip
Casting Time: 1 action
Range: Self (5-foot radius)
Components: S, M (a melee weapon worth at least 1 sp)
Duration: Instantaneous

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you. On a hit, the target suffers the weapon attack’s normal effects, and you can cause all damage dealt from the attack to be cold damage. For every 5 points of cold damage a target takes beyond the first 5 , the target loses 5ft of movement (ex. 10dmg -5ft, 15 dmg -10ft, ect.)

Until the start of your next turn, any other attack you make, also have their damage converted to cold damage, potentially increasing the movement penalty.

At Higher Levels. At 5th level, the melee attack you make as a part of casting this cantrip deals an extra 1d6 cold damage to the target on a hit. the damage rolls increase by 1d6 at 11th level (2d6 ) and 17th level (3d6).