A talisman of this sort appears exactly the same as a stone controlling earth elementals. 

Its power is quite different, and these are dependent upon the Charisma of the individual holding the talisman.

Whenever a character touches a Talisman of Zagy, a reaction check is made as if the individual were meeting another creature. 

If a hostile reaction result is obtained, the device will act as a stone of weight, although discarding it or destroying it results only in 5-30 hit points of damage and the disappearance of the talisman. 

If a neutral reaction results, the talisman will remain with the character for 5-30 hours, or until a wish is made upon it, whichever first occurs, and it will then disappear. 

If a friendly reaction result is obtained, the character will find it impossible to be rid of the talisman for as many months as he or she has points of Charisma. The device will grant 1 wish for every 6 points of the character's Charisma; and it will also grow warm and throb whenever its possessor comes within 20-ft of a mechanical or magical trap. (If the talisman is not held, its warning heat and pulses will be of no avail.) 

Regardless of which reaction result is obtained, when its time period expires the talisman will disappear, but a base 10,000 g.p. gem (diamond) will remain in its stead.