The only known way to free a being from the cage is to take a piece of the Protodermis and feed the same elemental powers that created it onto the piece. This method has been used by Roodaka to free Teridax.
Beings other than Toa and Krahka cannot combine powers of any sort to create a Protodermis cage. In addition, as long as each wields a different element, any six Toa can create a Protodermis cage.
- BIONICLE 2: Legends of Metru Nui
- BIONICLE Adventures 9: Web of Shadows
- BIONICLE 3: Web of Shadows
- Comic 4: Into the Nest
- BIONICLE Chronicles 2: Beware the Bohrok
- Comic 8: The End of the Toa?
- Comic 11: A Matter of Time...
- Comic 12: Absolute Power
- BIONICLE Chronicles 3: Makuta's Revenge
- Bohrok-Kal Online Animations
- It is believed that Toa Hordika could also make a Toa Seal. However, it would be considerably harder due to to their constant mental struggle.