Nigh invulnerable and just as vicious, these enemies will never stop pursuing you.
When building tension, video games are defined by the threats thrown at the player. Some threats are more vicious while others are tough to kill (or just plain invincible). Combine these traits together and let loose an entity that hounds the player, cultivating an atmosphere of fear over where it could strike next, and you've created an effective stalker. Let's take a look at 15 of the scariest stalkers in video games.
Alien Isolation's intelligent, menacing and nigh invulnerable Xenomorph is one of the more renowned stalkers in recent times. It can sense when you're using the motion tracker nearby, will investigate any strange occurrences or noises made, and pounce on you when least expected. It even travels through the air ducts, making it all the harder to discern where it could be coming from. Yes, it's scared of fire but limited flamethrower ammo means it won't be long before it returns.