People usually have to do things in order to live. They eat, drink, breathe, and do what's neccesary to live. But sometimes, there's more to it than that. Normally, people would kill other creatures to get the necessities of staying alive.
And then, there are those just need to kill things to survive. Not get any materials or pieces of creature or other beings. Just klling them is what they have to do in order to stay alive in the world. There could be two types.
. The character needs to kill once every certain period of time. They can't surpass that amount and any attempts would just keep them at a maximum.
. There is no limit to how often the minion must kill. As long as they don't run out of time, they can get as much as they want.
Subtrope of Trapped In Villainy
. Compare Horror Hunger
Anime and Manga
- In Fullmetal Alchemist, Father could be seen like this as long as he turns them into Philosopher's Stones. Pride seems to have the same ability like how he absorbed Kimblee and needing the Stones due to being a homunculus.
- The Eclipse infection from Magical Record Lyrical Nanoha Force slowly kills all infectees unless they do so to other people.
- Subverted in Preacher, where Cassidy (a vampire) reveals that while he does requires blood to survive, it doesn't even have to come from a live animal (when he does kill humans and drink their blood, it's mooks who were trying to kill him in the first place). He says this to a pretentious wannabe Classical Movie Vampire (who dresses in operatic clothes, kills humans to live, wears colored eye contacts, and broke both legs when trying to turn into a bat).
- From The Sword of Truth, the Banelings have to kill periodically (every day or so) if they are to stay in the living world.
- The Inca Mummy Girl in Buffy the Vampire Slayer episode of the same name had to kill in order to maintain her appearance as a young girl. She destroyed herself when she refused to feed on Xander.
- In Neverwinter Nights 2: Mask of the Betrayer the player character is afflicted with a curse requiring them to feed on souls periodically or their own will be eaten. Tricky part is, eating a soul increases the rate at which their soul is consumed. However a good-aligned character can, through certain dialogue options, gain the ability to feed on the necromantic energy powering undead instead, which does not increase soul hunger.
- In the PS2 title Shinobi, after your characters' sword awakens at the start of the second level, you must keep killing enemies in order to keep the swords thirst for souls quenched. Fail to do so, and it takes yours.