Of course, Liiza didn't only have to rely on Khan's tone to translate that alien language.
Mentioning the True Chaos' God caused a specific reaction in Khan's mind, which the mental connection shared. Liiza had also heard Khan's statement to the Nak back on the azure planet, which featured the same foreign feelings, allowing her to connect the dots.
Khan didn't want to face the True Chaos' God solely out of virtue of the Nak's mission. Defeating that universal threat was indeed his task and responsibility, especially after refusing the mana's legacy, but his request had more to it.
The True Chaos was a child of the mana. It was an unwanted and problematic evolution that energy had given birth to in its attempt to reach a superior realm.
That made the True Chaos superior to its progenitor and its natural enemy. Khan didn't know whether to consider it a being higher than the mana, but it was clear which one was stronger.
