A strong enemy that has control over many elemental attacks and the ability to change elemental resistances.
Before it transforms, the nunki will change its elemental weakness based on the element of its attack and after transforming while it will no longer change its elemental weakness it will use status ailment and fractional HP damage attacks.
It will also evade physical attacks regularly for a few turns. Be sure to have units that have many types of elemental attacks and can increase elemental resistances.