Grandiosity, deceit and manipulation are treats commonly associated with a narcissistic personality disorder.
People who display this type of disorder consider themselves uniquely special and superior to others. They may often talk about fantasies of their beauty, intelligence either to likeminded people they may be drawn to or potential admirers. Sufferers feed their egos on praise and may display manipulative behaviours if their demands for attention are not properly met.
Deceit can come in the form of deliberate crafting of stories or excuses as ways to evade signaling against a perfect self-image.
Both the causes of this disorder and ways to treat it effectively remain subjects of study given the multitude of converging factors and natural challenges for self-examination respectively.