GENOCIDE

The systematic killing of substantial numbers of people on the basis of their ethnicity, religion, political beliefs, social status, or other particularities.

"A genocide will always be followed by the denial that it ever happened."

(by extension) The systematic suppression of ideas on the basis of cultural or ethnic origin; culturicide.

The elimination of an entire class of monsters by the player.

To commit genocide (against); to eliminate (a group of people) completely.