Here some major events John stewart was in the last 12 years
Sinestro Corps War
In the Green Lantern: Sinestro Corps Special, the Green Lantern Corps are attacked by Bedovian, the sniper of the Sinestro Corps, who is capable of taking out a target from three sectors away, all from the inside of a red SUN EATER. After Bedovian takes out several Green Lanterns, John Stewart uses his power ring as a scoped sniper rifle to track the nearby sectors. He eventually discovers Bedovian's hiding spot and shoots him.
Green Lantern: Rebirth
With the return of Hal Jordan and the Guardians, the Corps has been reorganized. Each sector of space now has two Green Lanterns assigned to it, and Stewart and Jordan now share regular duty for Earths sector, 2814. After the dissolution of the Justice League in the aftermath of the events depicted in the 2004 miniseries Identity Crisis, and the destruction of their Watchtower headquarters on the moon, Stewart has begun playing a larger role in metahuman affairs, working with many former Justice Leaguers.
In Justice League of America vol. 2, #7, he and Wonder Woman designed one of the Leagues new headquarters, The Hall. John later resumes his role as the League's resident Green Lantern upon Hal Jordan's request.
War of the Green Lanterns
JOHN DETROYS MOGO
Blackest Night
When John visits the grave of planet Xanshi, thousands of black rings fly into the planetary debris, and reconstitute the entire planet. Xanshi itself then speaks to John, telling him "I can help you save them." Against his better judgment, John descends to the planet's surface. Once reaching the surface, John finds himself confronted by Katma Tui and the entire population of Xanshi as Black Lanterns. While battling them all, Katma tries to weaken John by claiming that he caused the planet's destruction. However, John, spurred on by Fatality's words, says that he wasn't the cause of it all and successfully fights off the Black Lanterns.] After escaping Xanshi's atmosphere, John realises that the planet is headed for Earth, along with every Black Lantern in the universe, and contacts Hal, warning him of the impending threat. Later, John is saved by combined efforts of the various Lanterns corps, who had just arrived to battle the Black Lanterns.
Trinity
Stewart appears in the Trinity series. He is the one to first attack the alien creature Konvikt, but when he's on the verge of defeating him, his concentration suddenly snaps, and starts muttering incoherently in binary code. A moment later, he spontaneously generates complex weapons from his body, by means unrelated to his ring. Later, he attempts to overexert himself to know how he generated those weapons by running a brutal training session against holographic Qwardian Thunderers, which does not work. He later shows Firestorm the machinery used to monitor the Cosmic Egg imprisoning Krona, but as he leaves again, he suffers from a relapse and start generating knives from his uniform, and it is revealed the entire system is broken.
Sinestro Corps War
The Sinestro Corps and the Manhunters invade Earth. The Cyborg Superman and Superboy-Prime attack Superman, while Hal confronts Parallax, who has possessed Kyle Rayner, just before the latter is about to kill Hal's family. John orders Guy to retrieve a painting by Kyle Rayner's mother. When Parallax absorbs Hal inside himself, John looks on with sudden shock. Guy returns and shoves the painting into Parallax's eyesight, allowing Hal to use it to help Kyle overcome his fears and expel Parallax. Now in its original form, Parallax is then contained by Ganthet and Sayd within the Power Batteries of Hal, John, Guy, and Kyle. Ganthet and Sayd then reveal that they are no longer Guardians. Ganthet gives Kyle a new power ring and asks Kyle to become a Green Lantern again, to which he agrees. The four then race off to finish the fight. At Guy Gardner's suggestion, John and the other Lanterns use Warworld as a gigantic grenade, badly wounding the Anti-Monitor, who is then thrown into space by Superboy-Prime.
Worlds Collide
After a massive battle between the JLA and the Shadow Cabinet, John chooses to stay with the League despite many of its members choosing to leave. After Kimiyo Hoshi goes missing while tracking down Shadow Thief, John blackmails the armored vigilante Hardware into helping the team track her down. The League arrives in the Himalayas, discovering Kimiyo and Superman's friend Icon engaged in a fierce battle with the cosmic vampire known as Starbreaker. The JLA defeats Starbreaker, and John takes a leave of absence to go to Xanshi.
# In Green Lantern (vol. 4) #26, it was shown that John's willpower exceeds the limit of his ring (when he tried to recreate a planet from scratch), a feat that had not been depicted before this point.
# John is a discharged member of the USMC with full combat training. In addition, he is an expert sniper.
# When he temporarily used Indigo-1's ring as a member of the Indigo Tribe, John was capable of accessing the powers of all Lantern Corps rings in his vicinity, even managing to harness the power of the Black Lantern Corps by drawing on the residual Black Lantern energy around Mogo's core. John is not shown to be significantly affected by the Indigo Ring's mind altering capabilities, although this could be because he was already capable of feeling compassion.
As well as his obvious powers as a Lantern, John has recently begun to demonstrate an ability to kill when he is certain the situation requires it, destroying Mogo in order to save the universe from the army of Krona-controlled Green Lanterns that Mogo would have created and later killing a fellow Lantern who was about to give in to torture and reveal vital information to their enemies.
# Stewart was briefly taught by Ganthet on how to reroute his mind to think in the 'language of the spheres'- the first language of the universe- to evade telepathic detection by Fernus, the 'Burning Martian' identity of the Martian Manhunter; although the intensity of this method meant that John couldn't use it for more than a minute without burning his mind out, it has never been specified if this means that he cannot use it again or if he could use it at some future date if enough time has elapsed since his last use of it.
# Like all Green Lanterns, Stewart's personality affects his ring's creations, giving them a solid, architectural quality. In Green Lantern: Rebirth, Hal Jordan remarks that "everything John builds is solid". He also remarked that Stewart is the best flyer in the Corps.
# Indomitable Will: John Stewart's willpower exceeds the limit on his Green Lantern Power Ring.
# Compassion: John has the ability to feel great compassion to such a degree, he can successfully use an Indigo Tribe Power Ring and an Indigo Tribe Power Staff.
* Green Lantern Ring Mastery: As noted by many, Stewart's constructs are never hollow. He builds them from the inside out, down to the last nut and bolt.
* Architect: John is an accomplished architect having had a hand in building the new Hall of Justice as well as rebuilding Coast City.
* Marine Training
* Flight Combat Expert