"When it came to the glory of Mhach, the ends justified the means..."
Cait Sith was once but a stray cat, caught in a downpour—one of many such squalls that frequented the skies in the late Fifth Astral Era. Voidmage Cessair, on one of her nightly walks through the Mhachi city gardens, picked him out of the rain, and, most thoroughly entranced by the soaking cat's innocent stare, resolved to transform him into her familiar. The feline's keen mind and civilized behavior are testaments to the High Voidmage's magical abilities, and Cait Sith remains loyal to her, even centuries after her demise. He has spent the last millennium and a half following his master's final order: to keep watch over the seals imprisoning the voidsent aboard the Ark, alll the while, treasuring the hand-made cloak given him by the late magus.
In speech and act, Cait Sith mimics the formality of the long-dead Mhachi mages. He resents being called "furball" by Leofard, and judges the parlance and attitude of the younger generations to be improper—a natural opinion, given his long life of fifteen centuries. Thankfully, he can be pacified with a good book or a dried cloudcrawler.
The Nullstone: Hidden deep within the great Mhachi pyramid which, to this day, towers over the salt-strewn lowlands of Yafaem, this weapon was created as a safeguard for those mages who forged pacts with voidsent. By severing the essence of a voidsent from the vessel into which it was summoned, the staff can banish even the most powerful of entity.