Parallax

- First appearance: 1994 in Green Lantern No. 50 (as Hal Jordan) / 2004 as the entity Parallax in Green Lantern: Rebirth No. 3
With Parallax, we welcome another cosmic entity to this list. It is the embodiment of fear itself and has existed since the emotion was first felt. Thus, it has existed for billions of years. It is a parasitic being that seeks hosts to corrupt them with its fear. This included Hal Jordan, the most famous Green Lantern.
Its powers are similar to those of the rings; it is practically the living form of them. It can create various constructs and change its form for combat. Its greatest strength, however, is the use of fear. If Parallax manages to instill fear or trauma, it can easily defeat or even control its opponents.
It also helps that it can manipulate reality and time to elicit fears. As a concept of fear, Parallax is also immortal.