Maplestory- How to Clear the Starstruck Kentauruses?

Defeat [*]Black Kentauruses, [*]Red Kentauruses, and [*]Blue Kentauruses at The Area of Black Kentauruses, Battlefield of Fire and Darkness, and at the Battlefield of Water and Darkness. If you tried to defeat some of these Kentauruses at the other locations that isn’t on the quest. You’ll not gain a slaying point for each Kentauruses you slayed.