Xiao's primary weakness is his true name, Alatus.
The Power of a True Name
In the lore surrounding Xiao, knowing his true name, Alatus, granted individuals complete power over him. This profound knowledge allowed others to manipulate and control him, leading to his enslavement in the past. It was a potent vulnerability that left him susceptible to exploitation by those who wielded this information.
Alatus vs. Xiao
It's crucial to distinguish between these two names:
- Alatus: This is Xiao's original and true name. It is the name that carried the immense vulnerability, allowing others to seize control and subjugate him. Under this identity, he endured a period of servitude to a cruel god.
- Xiao: This is the name bestowed upon him by Rex Lapis, also known as Zhongli. This name symbolizes a new beginning for him, freeing him from the binds and curses associated with his former life and the power his true name held over him. The name "Xiao" does not carry the same inherent weakness or vulnerability as "Alatus."
Therefore, while Xiao is a powerful illuminated beast and Adeptus, his deepest historical weakness stemmed from the inherent power others could exert over him by knowing his genuine identity, Alatus.