Enemy (Kill) is a Specification of the Generator Property.

Kill (Enemy) is a Generator type that requires a player to destroy an enemy, in order to collect the resource from the game world. This includes killing the enemy, then looting it.

Enemies constitute everything that poses a challenge for the player, and prevents the player from reaching a goal. Enemies are a well-known standard in most games, and the interaction and discourse surrounding the concept of enemies is well known.

Always found in Archetypes:
-

Occasionally found in Archetypes:
Ammo, Potion, Skill Point, Currency, Rune, Material, Mana, Rage, Physical

Found in Games:

Game - Bioshock 2 (Ammo, First aid kit, hack darts, hypo)
Game - Crysis 2 (Ammo, grenades, Nan-collection)
Game - Deus Ex; Human Revolution (credits, alcohol/food)
Game - Diablo 2 (gold, arrow/bolt, potions, gems/runes, grenades, identify scrolls, town portals)
Game - King's Bounty; Armored Princess (mana, dragon rage)
Game - Kingdoms of Amalur; Reckoning (gold, materials/reagents, potions, shadow prisms, lockpicks, repair kit)
Game - League of Legends (gold)
Game - Osmos (matter)
Game - Plants vs. Zombies (coins)
Game - Puzzle Quest 2 (gold, materials)
Game - Revenge of the Titans (dollars)
Terraria (perpetual resources)