Fire Elemental:
 
 
banishing item - Neptune's Horn
reward - 600 coins, 6 Energy Points, and a Fire Guardian Chest.
 
Werewolf Leader: 
 

banishing item - Silver Fang
reward - 600 coins, 6 Energy Points, and a Full Moon Chest.
 
Clot of Dark: 
 

banishing item - Greek Fire
reward - 600 coins, 6 Energy Points, and a Dark Servants' Chest.
 
Gremlin Leader: 
 

banishing item - Web of Lightning
reward - 600 coins, 6 Energy Points, and a Gremlin Chest.
 
Medusa: 
 

banishing item - Mirror Shield
reward - 600 coins, 6 Energy Points, and a Medusa Chest.