Cold Manipulation

Cryokinesis is the power and ability to manipulate generate and control ice and snow at will, create unusually strong blizzards, snowstorms and snowfall, and freeze an entire area, room or building with solid ice and create a variety of shapes out of solid ice.

In the second season premiere "Control" a special full moon sends the 3 girls to the moon pool giving them stronger powers. Emma's Hydro-Cryokinesis powers enables her to go even higher levels, and grants her new powers and new abilities that are much stronger and much more powerful. Her newest-much stronger- mermaid power and ability is full-blown cryokinesis.