Sodam Yat grew up on the planet Daxam with his father and mother. Daxam is a planet whose inhabitants are quite isolationist minded. This was difficult for Sodam who was interested in space and life beyond his planet. This also brought him into conflict with his parents. This came to a head when he was about 8 years old and found a crashed alien. He nursed it back to health and the two became close friends. When his parents found out, they had the alien killed and put Sodam through conditioning to help him get over his fascination with space. This worked until his class took a trip the museum, where Sodam saw his friend stuffed and propped up in a model attacking a daxamite. From then on, though he continued to play the good son for his parents, he spent his weekends rebuilding his friends ship. The day that he was preparing to launch and leave Daxam behind was the day he entered the Green Lantern Corps. Sodam then went to basic training on Oa under Kilowog. When the Sinestro Crops War broke out, Sodam was among the rookie members chosen to accompany Kilowog to defend Mogo. During the battle he served with distinction, so much so that he was among those Kilowog chose to send to infiltrate the living city of Ranx. During that mission he showed his leadership skills, taking charge and giving tactical orders that even Stel found logical. At one point during the battle Mogo contacted him relaying orders from the Guardians to leave the battlefield and explaining that they both played important parts in a prophecy regarding the future of the corps. Sodam disobeyed those orders and stayed in the battle. He led what remained of Green Lantern forces into the heart of Ranx. It was upon they're arrival that the first new law was introduced and Sodam avenges the death of Lantern Chthos by killing Enkafos. In light of the danger involved with destroying Ranx he ordered the other Lanterns to safety and finished the job himself. After destroying the sentient city, Ranx, during the Battle of Mogo, Sodam had proved that he was a very skilled warrior.

Sodam Yat has recently been upgraded to the status of Ion after Kyle Rayner had been infected by Parallax. The Green Lantern Corps were able to retrieve the Ion power and bestow it upon Sodam Yat. After the transformation, he immediately engaged in combat with Superman-Prime.

The newly appointed Ion fought Prime blow for blow until he crashed into a nuclear power plant made of lead. Yat was still not used to the Ion powers or the gifts the yellow sun gave him. After Prime impaled him with a rod, Yat realized that lead was one of his weaknesses. He immediately retreated and flew from the plant. However, his opponent was not far behind. Prime impaled Ion again from behind and they crash landed in a cemetery. Yat was beginning to understand that he needed to use all the powers he could to defeat Prime, even if it meant killing him. Yat managed to slam Prime against a tree using a tombstone. Superman-Prime quickly countered this and Ion was relentlessly beaten on by the Kryptonian villain. Yat was knocked out and carried into the air by Prime. Lucky for him, help was on the way.

Yat was injured for the remainder of the battle. He is later seen training on Oa with other Green Lanterns when Kyle Rayner comes and gives him a few tips on being Ion. Alex Nero appears and attacks them. Yat shows great potential when he outsmarts Nero and stops him. Yat explains that he can't take off the ring or the lead poisoning from the battle with Prime will spread.

Sodam is next seen in sector 2814, using the last of his shore leave. He is in reminiscing on his battle with Prime, in front of our sun. While he’s recharging his ring notifies him that his presence is required on Oa, an he eagerly heads back. Upon Sodam’s return to Oa he heads to the Guardians Citadel. There he waits for all the lanterns who have been summoned to arrive, while passing the time talking to Bzzd. When the final lantern, Gardner, arrives the assembled lanterns including Rayner, Arisia, Soranik, Iolade, Vath, Isamot, and Stel enter into the Guardians Chamber. It is there that the Guardians reveal the reason for the summons. A number of Sinestro Corps rings have plunged into the uncharted Vega System, and fallen off of the radar. It is because of their exemplary service during the war these Lanterns have been chosen by the Guardians to retrieve them. Sodam is quick to bring up the ban forbidding Lanterns to enter the Vega system, prompting the Guardians and Gardner to note that some rules need to be broken. He also questions why they don’t just hit the source of the rings, and keep them from being produced. A plan that Vath and Isamot, both former soldiers, seem to agree with, though the Guardians do not, restating the plan and dismissing them with the message, “Do your duty, Lanterns.”

 Sodam and the rest of the team head to the Vega system. Upon arrival Kyle and Guy order them to split up, giving times for mission updates and a rendezvous point. Sodam is partnered with Arisia again. While they search for the rings he asks for her opinion on how he’s been doing as Ion. It’s revealed that not only was Arisia was considered first choice for Ion, but that she’s also been asked to evaluate Sodam. So he asks her for her opinion on where he can improve, but they are interrupted by a captured Sinestro Soldier, and the signature of another ring. Sodam and Arisia follow the signature down to the planet Sedas, and to a maximum security penal institution for the criminally insane. They find the hospital to be a graveyard. Every inhabitant of the hospital has been murdered. Sodam and Arisia notice a difference in the ring blasts, one being messy and random, while the other is far more precise. Just as their rings warn that “Glaring distortion/disruption levels detected between rings and host—shields affected” and recommends departure, Sodam and Arisia are attacked.

When we see Sodam and Arisia next they have been captured by Duel, the Sinestro responsible for the hospital massacre, and Mongul. While the others begin searching for them, Sodam and Arisia are subjected to the black mercy. Mongul’s black mercy’s have been altered to show fears. In his fears Sodam is beset on all sides by darkness, his ring is cut off and being assaulted by different colored rings. Sodam and Arisia are allowed to  sink into the planet by Mongul when he leaves. They are found and rescued by the others. Just before Soranik, who treated his injuries after the war, can take them back to Oa they are attacked by Mother Mercy.