Lassar, during its years of service in the Second and early Third Ages, was a massive fortress on the edge of Zaros's main kingdom. Its main features, according to Azzanadra, were impressive spires. It existed atop what is now known as Ice Mountain, a large mountain in northern Asgarnia. At the time, Asgarnia is believed to have been much colder than it is today, yielding snow year-round; yet nearly all of it had been settled by the Zarosians.