Bal

 is a boss that spawns in Khazad-dûm of Crystal Hollows. On defeat, a chat message reading appears and the Topaz Crystal is dropped.

Dialogue

 * You cannot best me!
 * Grrrr! You won't be able to hit my Fire Bats!
 * Bah! Come forth my minions! Fly above, take them out!
 * AGGHHHHHHHHHHH!