The Horn of Valhalla
Schallat has been carrying this old ivory and brass horn around with him for a long time, and it has proved useful on many occasions. The berserkers it summons aren't fearsomely powerful, but there is enough of them to cause chaos and confusion - a state that the lizard man enjoys. It's just a pity that it only works once a week.
Disclaimer: No responsibility is taken for the actions of the berserkers once summoned. Neither do we accept liability for lose of life or limb when you blow it in Ravenloft and end up summoning a huge horde of zombies, ghouls and other nasties.