The Book of Knowledge once told him that to discern if a soul is the Ancient Evil Thought, there's only one way: dissect the soul in Freezing State.
Of course, this will also lead to complete soul death.
Unless it's absolutely certain he's the reincarnation of Ancient Evil Thought, it cannot be used.
Large-scale mutual suspicion among humans leading to internal friction is also one of the means by which Doomsday believers weaken the Fire Spark forces.
But Rod has a trump card — [Divine Sense]. By consuming 10 points of Divinity, he can use its ability [Spirit Mechanism], briefly gaining God-like wisdom.
As long as he has a suspect, a single use of [Spirit Mechanism] instantly grants him the reasoning ability of an elementary school student, making it instantly clear if they are a Doomsday believer.
Even if he's wrong, it doesn't matter. Rod has decided to invest 200 points of Divinity for this, which equals the effect of 20 uses of [Spirit Mechanism], to play trial and error.
