My character in Carrion Crown discovered the Canopic Stone after defeating the Vilkacis [spelling?]. A good Knowledge (Religion) check and some basic deduction and he (my character) knows that it contains the spirit of the creature. He is also just the kind of person that might try to use the power of a Vilkacis, believing that he could control it (he has Command Undead). What I don't know, is how it works mechanically.
Is the Canopic Stone a Spell Trigger, Command Word, or Use Activated in the sense of how it can be used to summon the creature?
Could a Use Magic Device check allow me to use it?
Under the "Creating a Vilkicis" entry it says that you can summon one once per day. Can it be dismissed? How long does it last? Or does it stay until destroyed?
If it is destroyed, can it be summoned again the next day? Or do you have to wait 2d4 days?
Also, will the Vilkacis ever spontaneously summon, like at the full moon?
You should probably ask your DM. The canopic stone is a magic item, and you can identify it through the normal means.