Liberation of the Kasha [3]

The most chilling trait of a 'Spirit' user was their ability to cast a spell directly into someone's mind without their awareness.

The trigger could be something deceptively ordinary—a leaf, a trinket, or an unassuming object.

These objects were often known as 'singularities.'

The instant someone's gaze fell upon a singularity, the spell could already be woven into the fabric of their thoughts, taking hold before they even realized it. The weaker someone was, the less likely they'd be able to spot the singularity. 

An especially powerful 'Spirit' user, could trick anyone into falling for their trick. 

This was precisely why Spirit users were so feared, and why rigorous checks were necessary to ensure no one remained controlled by the spell. 

"You're all good. None of you are still being controlled." 

Thankfully, the checks weren't too difficult.