Ian's ascension to demigod status meant that although his combat abilities were somewhat diminished, his vitality was indeed tenacious.
Even with the complete loss of form and the annihilation of all other hosts around him, he was even capable of directly corrupting himself with a wisp of remnant thought.
Furthermore, Fu Qian still tended to believe his words, and even in mutual destruction, that guy was very likely to make a return from the dead.
Perhaps thousands of annihilations could result in the dissolution of his consciousness to zero, but Fu Qian himself didn't have so much time or SAN Points to waste.
And that was precisely where Ian's confidence came from.
However, it's uncertain whether Ian had ever seen a movie called "The Terminator."
To kill something that can't die, the simplest method is to do it before it becomes immortal.
And as it happened, Fu Qian seemed to be in possession of this technique.