Purple Eye (퍼플 아이, peopeul ai) is an observer that is owned by the Purple Eye Brothers and is their main item used in battle and is likely the reason for their name.
Appearance and Capabilities
It looks like a large purple eye with wings and it has one known special ability called Slow Eye, which slows down whoever is targeted. However, this attack was reflected by Yeo Miseng's observer, which gives question to how powerful this observer really is.[1]