The next morning, Darius walked towards the Great Library with zest. He had long since noticed that he was carefully being tailed by some assassins who had concealed themselves quite smartly.
Unfortunately, Darius had thought of a way to counter such things during his 5-year seclusion, and among the slew of spells he had leaned was one belonging to the Spirit element.
[Soul Sense - Level 1 Spell
Grade: Intermediate
Cost: 10 MP
Description: Send out waves of spirit force in all directions, echolocating all other spirits/souls within a certain range of yourself. The range is 100 meters.]
This was a supremely useful skill. No matter who or what, everything that existed had a spirit or soul, especially among orthodox races.
There might be entities like automatons or machines that had neither spirit nor soul, but Darius would find ways to guard against such things when he had the means.