Azule's Frostbite

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 blue ice to form on the target's extremities. The Target's takes 1d8 Cold damage and has it's movement speed reduced by either half or 5xPB (whichever is the smaller number).

This spell’s damage increases when you reach certain levels.
The Damage roll increases by 1d8 at 5th level (1d8), 11th level (2d8), and 17th level (3d8)