Humanity challenging the gods was irrational to begin with.
No, calling it irrational was actually putting it nicely.
To put it more harshly, it was downright foolish.
Although gods could be strong or weak, and some even lacked the slightest bit of power because of the nature of their divine offices, Quetzalcoatl was clearly not one of them.
Even without using her Authorities, Quetzalcoatl was a god of war.
Since she was a god of war, Quetzalcoatl's combat ability could be imagined. Even if she relied solely on her physical body, she would still be far stronger than the vast majority of Servants.
On top of that, Quetzalcoatl's parameters were not weak to begin with. Her Strength and Endurance were both B-rank, her Agility was B+-rank, even her Luck was A+-rank, and her Mana had reached the extraordinary level of Ex-rank, just like Ishtar's. These parameters alone were enough to place her among the ranks of top-tier Servants.
Quetzalcoatl was so powerful that even compared to Servants of the extraordinary tier, she would not be inferior in the slightest. If she fought Servants on the level of Scathach and Karna, she could probably match them evenly, right?
Of course, both Scathach and Karna possessed God Slayer Noble Phantasms. In terms of compatibility, Scathach and Karna should ultimately win if the two sides fought. But without taking their God Slayer abilities into account, Quetzalcoatl would not be weaker than either of them.
If she was already this powerful without using her Authorities, how could a human possibly defeat her?
Yet Quetzalcoatl still accepted Luo Zhen's challenge.
First, she would never refuse a challenge issued directly by a human. It would only make her feel delighted and admire the other party's courage.
Second, Quetzalcoatl knew that Luo Zhen was no ordinary human.