Substanciakinesis is the ability to harden water into a substance similar to glass or crystal. In H2O: Just Add Water, Cleo Sertori and Bella Hartley combined Substanciakinesis and Hydrokinesis to make a mermaid sculpture for Rikki Chadwick's birthday. The merpeople who have this power is Isabella 'Bella' Hartley from H2O:Just Add Water.