Nanka are supernatural beings that are servants of the Evil Gods. They are sent to Titan by their masters to ensnare the souls of certain mortals (normally those who would defy the malign plans of the Dark Lords and their minions) and to transport those souls to the Void for their masters to feed upon.
They are invisible to mortals but should they wish to be seen they manifest themselves as a vague humanoid formed from thick black smoke in which a pair of dark eyes glint wickedly.
It has been written that a favourite trap of the Nanka is to hide in a glass phial as a Genie hides in a lamp. When the phial is unstopped it will flow out as a cloud of smoke and envelop the person who has released it. Thus its prey is trapped and it will return to its master.