Truly a Deadly Sin

Reality Warping.

A lesser version of Existence Manipulation.

This was the power of the 'Sin of Pride'. Their 'Authority'.

But the energy cost of using this great power was just as ridiculous as what it could do.

Magic, Demonic Energy, and the emotional energy of Pride—these were the things Roselia could use to power her Idiosyncrasy, in order of increased efficiency.

Magic power was horribly inefficient, Demonic Energy was so-so, and the emotional energy of Pride was the wonderful option.

But as mentioned earlier, she still needed a lot of it.

The current Roselia was also 'Limited' in what she could warp, as she neither had her full power nor was she a higher existence yet.

It was because she realized this 'Limitation' in her warping abilities that she created this Bounded Field of hers to amplify her range of power application and increase the potency, making it harder for opponents to realize they were in a fake reality.