The Goddess of Plague nodded slightly and fed another biscuit to Ahtal.
Seeing this, Xi Mu continued, "If she assumes your identity as her avatar, she will unleash pestilence through your power, infecting countless people to become her avatars."
In the first major storyline of the DLC, the pestilence is what players progressively uncover to find the true mastermind behind it, encountering many demons and witches in the process, including the Pestilence Witch. After locking onto the Goddess of Plague through the Pestilence Witch's abilities, they will slay the Goddess of Plague once.
However, this time the Goddess of Plague does not need to die but falls into a weakened state and, after thanking the player, returns to the high heavens to recover.
And if players are patient enough to wait, when the game progresses to the midway point, they can choose the Goddess of Plague as a companion.
We are ushering in an era free of illness.