'Two is the limit.'
Simon's eyes flashed with a calculating and calm glint as he placed a finger on the side of his head due to slight headache he had from failing to form a third Eye.
That limit was not permanent.
As Simon's proficiency with ShadowEye increased, he would become capable of creating more Eyes. Their duration and the distance across which he could maintain a connection would also increase.
For now, each ShadowEye could exist for approximately twenty four hours.
That was under normal conditions.
If Simon constantly watched through one, the continuous transfer of sight, sound, and demonic energy fluctuations would consume more mental energy and reduce its lifespan. Leaving the Eye dormant until something disturbed its shadow required far less energy.
Distance worked in a similar way.
Shadow Eye did not possess a fixed range that suddenly ended after Simon crossed a certain point. The connection was maintained through his mental energy and shadow energy.
