Meidogan

The is a dōjutsu used by Miyuki Ōtsutsuki as Kārī. It is characterised by its plain, glowing fuchsia irises and purple pupils, while the sclera seems to turn pitch black and ethereal flames sprout from the eyebrows.

Overview
The full extent of this dōjutsu's abilities are so far unknown, though Kārī uses it to create powerful genjutsu akin to the Sharingan. She's also seen using attractive and repulsive forces, including telekinesis, similarly to the Rinnegan's Deva Path and the Tenseigan.

Miyuki's Byakugan changes into the Meidogan every time she reveals herself as Kārī, accompanied by the appearance changes, but it isn't specified whether or not this is a sort of chakra mode associated with the Meidogan or otherwise just a transformation.