On the second thought, Shadow took out his hand and pointed at it with his other hand, by using his index finger, he drew an invisible figure on his laid out hand and after finishing, he showed his hand out to the Leshy who had his head bowed down so he couldn't see what was going on.
The invisible figure became visible golden lines that were a form of spell that he had written down. He touched Leshy's head with the hand that had the rune.. it quickly got absorbed within the creature's body before he let go of him.
With that spell, he'd be able to control the Leshy. He'd be able to know where the Leshy was and what it was doing. With that spell, the Leshy was bound to him as a slave and he wouldn't be able to disobey or betray him, unless he managed to break the spell, which would be impossible to do.
Breaking the spell that he had installed on The Leshy wouldn't be easy at all and that was Shadow's advantage.