Cone of Frosting

Swirling your hands in clockwork motion, a torrent of sticky freezing sugar shoots forth from your outstretched fingertips. Each creature in a 15ft cone must make a dexterity saving throw. On a fail, a creature takes 3d4 cold damage and its speed is reduced by 10ft until start of your next turn. On success, a creature takes half damage and isn't slowed. 

At Higher leveles. When cast with 2nd level spell slot or higher, damage increases by 1d4 for each spell slot above 1st.