|Fortress Destroyer Towers|
|- Hartkern -|
|Damage per Minute||10140|
|Rate of Fire||52|
|Weapon Class||Missile Launcher|
|Penetrates 14 points of enemy armor|
Hartkern is a Hyper Rare Missile Launcher, and can only be obtained after level 30. Hartkern is german for "Hardcore". The Hartkern is great for taking out relatively high armoured enemies, such as the Kraken.