The Angler’s Probe

After spewing the rotting liquid, the scavenger kun gradually calmed down. The Puppet Spell was an evil spell that was completely banned among human cultivators, given how malicious it was in principle: what it consumed wasn't the energy of the spellcaster, but the energy of the living being under the spell, who would continue to produce "energy" at the cost of their lifespan until they were dried up.

When this spell first became prevalent thousands of years ago, those that were under the spell were slowly squeezed completely dry of all their energy by the spellcaster before they ultimately died, while the spellcaster wasn't the least bit harmed!

Immortal Zhenyuan couldn't be sure whether this scavenger kun was being controlled through the Puppet Spell, but what was certain was that this particular spell worked pretty much in a similar way.