Mergo

Mergo refers to a specific in-universe entity within the video game Bloodborne. It is presented as an infant, albeit one of immense power and cosmic significance, at the center of the game's narrative. The lore surrounding Mergo suggests it is a Great One, a powerful, god-like being from beyond the human understanding of reality. Mergo's existence is tied to the "Night of the Hunt," a recurring event in the city of Yharnam where hunters pursue beasts.

The player character's ultimate goal in the game involves confronting and ultimately putting an end to Mergo's influence or suffering. This is often achieved through a climactic boss encounter, "Mergo's Wet Nurse," which is depicted as a formidable guardian of the infant. The presence and nature of Mergo are central to the themes of cosmic horror, incomprehensible existence, and the consequences of meddling with powers beyond human comprehension that are prevalent in Bloodborne. Its cries are said to echo through the corrupted city, a persistent reminder of its ethereal and unsettling presence.