Ghorion was once one of the Three Troll Kings of the Cloudsteeth Mountains. Undeath has only made him crueler, and much, much more powerful.
They were formidable even before they learned how to use weapons.
Nahactl, the Wanderer
The Trollshaw Staff is roughly six feet tall, though if the bends in the wood were pulled out straight, the staff would easily be eight or nine feet tall. As it is, it is twisted as a troll itself.
The creation of intelligent magical weapons is not an exact science and there are occasional failures, as such think of causing a little more stress to your players by "rewarding" them with an insane magical weapon
Agrophobic, refuses to come out of the scabbard without a strength check to draw it.
Haemaphobic: afraid of blood, fight at a penalty against any blooded creatures but really good against undead, elementals etc
Schizophrenic, not just one mind in your sword, lets have half a dozen minds in there, all different and bound to cause confusion
the possibilities are endless