Vampyr-game-link -

: You gain significantly more experience points (XP) by consuming named citizens (1,000–5,000+ XP) than by killing regular enemies or completing quests (5–400 XP).

: Choosing to be "evil" and embracing citizens makes the game easier by allowing you to unlock and upgrade powerful vampiric abilities more quickly. vampyr-game-link

Vampyr is a nice detective game with several unique mechanics : You gain significantly more experience points (XP)

: As a doctor, you can treat citizens' ailments to improve the "quality" of their blood, which increases the XP they yield if you eventually decide to feed on them. vampyr-game-link