Actually, the name of the eye technique was not important. It was all about the definitions for Roy in any case.
If there was a need, Roy could even shoot out kinesis light waves with the Sharingan…
If he wanted to see through illusions and not be affected by them, he needed to have the ability to perceive and distinguish reality from illusion. Roy drew his demon eyes on the system's design panel.
Then he drew a blood-red pentagram in his pupils to distinguish between using eye technique and not using it.
Demons, of course, used pentagrams for show…
Roy named his eye technique 'Eyes of Nightmare'!
Eyes of Nightmare
Definition 1: Insight. Can see through and break illusions, distinguishing between reality and illusion.
Definition 2: Fear. Enemies looking directly at these eyes will have inexplicable fear arise from the bottom of their hearts.
