The Kanohi Dayku is the Mask of Shape-Shifting. It allows the user to assume the form of any Rahi they have seen. Unlike wearers of the Great Mahiki, Dayku wearers can actually shapeshift. They can shapeshift into Rahi smaller than or equal to their own size, but they cannot shapeshift into larger Rahi or copy a Rahi's powers. The Noble version has the same powers as the Great, but a shorter duration.
- Lyse - Formerly; became Great when he was transformed into a Toa Terra.
- Zera - Formerly; became Great when she was transformed into a Toa.