Salaak is a member of the Green Lantern Corps.
Before the Parallax war, Salaak was responsible for the Oan archives, which chronicles the history of the Corps and the Guardians and for that reason he has great knowledge of it. Because of the culling, he had to dispatch for the now meager Corps and during that time many portions of the Oan archives were destroyed.
Salaak contacts John Stewart in New York City in order to let him know that there is a new recruit in need of orientation and adjusting on Earth. John questions the decision of having another human as a member of the Corps which Salaak mysteriously says "who said he was human?"
On the Moon, a group of Green Lanterns, including Salaak, explain to Superman and John that there is no treaty between the Guardians and the Manhunters and one of them suggests that these Manhunters were rogue units that have gone mad without a purpose. Superman asks who created the yellow rings that powered the robots and the Lanterns explain that in order to battle the Manhunters, the Guardians took extreme measures. After this revelation the Lanterns decide to return to their sectors and report to their post. Before leaving, Salaak, says something to John, requesting not to reveal it to the other Lanterns.
In space, a small group of Green Lanterns observe the battle on Earth. Aya says that they had agreed to not interfere but Salaak confesses that he feels responsible for what happened, even though he had good intentions. The Green Lanterns are not sure if they can fight Parallax because the last time they did it, most the members of the Corps were killed and Oa was almost destroyed. Salaak then plays John's message about the one thing that frightens Parallax, so they decide to find it and stop the fear entity once and for all.
When Parallax is about to attack Superman and the depowered John Stewart, the real help comes when the Green Lanterns arrive on the scene with the entity of willpower. Unfortunately with the yellow power rings getting reset the same happens with the green ones, leaving the Green Lanterns temporarily depowered as well. The two entities begin to battle and with an assist from Superman, they banish Parallax to its realm, which was his greatest fear.
In the aftermath, the Green Lanterns reevaluate their mission parameters and as their rings finish their reboot, they decide to choose their own destiny.
In the Comics
Salaak (sometimes incorrectly spelled Salakk) is a veteran Green Lantern and has served in many Corps campaigns over the years. He is a famous pessimist and loner, a creature of protocol and laws. During the Crisis on Infinite Earths he protects multiple sectors, but found the experience depressing. After this, he went to Earth looking for company among his fellow Green Lanterns. For a time Salaak lived in the future and while there, Salaak was married to a human woman. Salaak returns to the present day to warn about the destruction of the Corps. He was too late to stop the execution of Sinestro. The Central Power Battery on Oa ends up destroyed and with it, Salaak's ring is made inoperable. He finds transport to H'lven where he reunites with Ch'p, a good friend of Salaak and one of the few Lanterns whose ring still functioned. Salaak remains on H'lven and acts as Ch'p's advisor until they discover that the Guardians have returned and have rebuilt the Corps. The two later petition for reinstatement, but Ch'p is killed in a traffic accident.
Salaak ends up captured, along with multiple other Green Lanterns and one Darkstar. They are scheduled to be sold into slavery but former Green Lantern Guy Gardner, with powers underived from a Power Ring, rescues the entire group. Salaak attends Hal Jordan's memorial service on Earth. The Corps, reformed again, has Salaak as the senior administrator and the Keeper of the Book of Oa. The Book tells of the adventures of multiple Green Lanterns throughout the history of the universe. Salaak reinforces the squadron of Lanterns sent to save Mogo from Ranx the Sentient City and other Sinestro Corps members. He has expressed displeasure at the fact that the Guardians have rewritten the Book of Oa to allow lethal force against members of the Sinestro Corps, but is still committed to serve. He survived the Sinestro Corps War without major injuries and he continues to hold onto his position as keeper of the Book of Oa. He is kept out of the loop in some instances by the Guardians who neglected to tell him their plans to create the Alpha Lanterns. During the Blackest Night, Oa comes under siege from the Black Lantern Corps. With the Guardians missing, Salaak takes command of the Green Lantern Corps as Clarissi and thus the next in succession after the Guardians, preventing the Alpha Lanterns' attempt to take control. As his first command decision, Salaak decrees that all fallen Lantern rings be sent to Mogo, so as not to endanger any new recruits.
After the War of the Green Lanterns, Salaak went along with the Guardians' orders to prepare a space for Krona in the Green Lantern memorial hall despite the other Corps members' anger at such a decision, despite Salaak claiming that the Guardians want to remember the good that Krona did in helping to found the Corps rather than the evil he committed later, with the other Corps members denouncing him for his blind loyalty. When Kyle Rayner is briefly turned into a ring magnet, Salaak attempts to remove Kyle's Green Lantern ring on the Guardians' orders. Kyle's ring resists Salaak's attempt at removal as Kyle protests the decision and what they did to Ganthet. Later, Salaak assigns the Green Lantern B'dg to find Hal Jordan on Earth and discovers that the green rings are being delayed under the authorization of the Guardians to which he also secretly informs Kilowog of these events. Concerned at recent events, Salaak begins to spy on the Guardians, learning of their plans for the Third Army. He is subsequently caught and locked away despite his protests that their plans are wrong. After the unemotional Guardians are killed off by Sinestro, Salaak is freed from his imprisonment by Kilowog and Guy Gardner.