Dark Fess

Dark Fess (ダークフェッセ Dāku fesse) is a hidden boss in Lust Friend. She can only be encountered on the genocide route of the game.

Appearance
Dark Fess looks similar to the usual Fess, with long blonde hair tied into twintails, horns, bat-like wings and a spaded tail. However, her eyes are red instead of gold, and her clothing covers more of her body than Fess' clothing.

Personality
Dark Fess has a drastically different personality to Fess (or to Empress, the one controlling Fess for most of Lust Friend). Due to (almost) every other succubi being killed, she has fallen into despair and has given up on trying to save the succubus world. She considers herself responsible for Magrut's actions, as she was the one who brought him to this world. She wishes to break Magrut's will by killing him, again and again, until he (and thus the player) gives up on the game. Additionally, during her H-scene, she expresses a desire to destroy the human world after she's done with Magrut.

History
For Dark Fess to appear, Magrut must kill all of the succubi available in the game. Fess will confront Magrut, becoming Dark Fess, and attempt to kill him until he (and by extension the player) gives up. If Dark Fess is defeated, she warns them that even she doesn't know what will happen next, and disappears. A fairy (now named a "Save Fairy") will appear, congratulate the player for "clearing the game" and give them the option of saving.

Strategy
Dark Fess is a simple and yet also challenging boss. She begins the battle by stripping you and draining 20 of your levels. On her first turn, she does nothing. On her second turn, if she's still wearing her clothes, she uses Last Fragrance, a skill which seemingly does nothing. On her third turn, she uses Handjob followed by Forced Facesitting, which will inevitably kill you. However, if you can make her strip by her second turn, she will instead spend several turns using weaker attacks or doing nothing, then use Last Fragrance followed by Forced Facesitting.

Consequently, it is necessary to do enough damage to Dark Fess to make her strip within two turns, then continue attacking to defeat her before she can use Forced Facesitting. She is weak to Chest attacks, but aside from this, the only thing you can do to improve your chance of success is make your attacks as powerful as possible. One way to do this is to equip the Empty Book from the Succubus House. With this equipped, it should be possible to defeat Dark Fess with three Chest attacks.