Chromia and her sisters were held in reserve as NEST entered Shanghai to deal with Demolishor, only being called into action when the presence of a second Decepticon, Sideways, was detected. Together with the twins, the sisters pursued the sneaky speedster through the streets of Shanghai, smashing through buildings and everything else in their way, but they were ultimately unable to do little damage, and Chromia found herself a bit battered for her efforts. So Sideswipe was brought up to bat, and proceeded to make short work of Sideways.

When The Fallen issued an ultimatum to Earth, the US government decided that the Autobots would be shipped back to Diego Garcia, but NEST disobeyed the orders, instead shipping Chromia and the others to Egypt on the advice of Sam Witwicky, who had the means to resurrect the recently deceased Optimus Prime. During the climactic battle between NEST and The Fallen's Decepticons, the sisters arrived with Ironhide to help escort Sam and Mikaela through the warzone, but both of Chromia's sisters soon fell to Decepticon firepower as the conflict heated up. Revenge of the Fallen

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During the dark period of Cybertron's history when the AllSpark was lost and the planet drifted through the cosmos without a sun to orbit, Chromia and her sister Arcee lived in Metrotitan. Once both the previous problems were rectified and Cybertron entered a new era of freedom, their older sister Elita-One was able to be reunited with them. Foundation #1 The three sisters were present when Sentinel Prime announced that Cybertron would be under the dual rule of Optimus Prime's Science Division and Megatron's Defense Force. Chromia chose to join the Defense Force, where she befriended Ironhide and aided in taking out "malcontents" who were opposed to the new order. Foundation #2 Many years later, she and Ironhide witnessed Optimus and his team escape an assassination attempt by Starscream. She followed Optimus to an excavation site and helped him foil an attempt on Sentinel, Elita and Wheeljack's lives.

During the war, Chromia, Ironhide and Arcee led an assault on Simfur Temple, so Elita could use the AllSpark to activate a "torch" created by Sentinel that would end the war. Foundation #3 Megatron knocked Chromia aside, and Ironhide carried her off the battlefield when Sentinel's ship was destroyed. With the Decepticons weakened after the initial attack, Chromia soon returned with Arcee on Wheeljack's Ark and stole the AllSpark. Foundation #4

Around the year 1908, many years after the war broke out, Chromia and Elita-One were part of an Autobot team sent to steal energon from the Decepticons. Instead they were ambushed by Shockwave and his troops, and Chromia was killed in action. Her corpse was taken by the immoral Decepticon scientist Flatline, who considered it perfect for use in his experiments. Rising Storm #2

Flatline took Chromia's body (along with the corpse of her sister Elita, who had died later on) to his lab at an outpost on an unknown planet to use in his attempts to create a new breed of tripartate soldier, three bodies fuelled by a single spark. After several failures, whether by coincidence or design, Flatline was presented by Thundercracker with a new test subject: Elita and Chromia's sister, Arcee. Through the use of Arcee's spark, implanted in a new body, Flatline reignited the life-forces of Elita and Chromia in new shells, albeit not as they had truly had been before: now, they were at one with their sister, a singular entity at the spark, each feeling the sensations and emotions of the other, yet retaining some degree of autonomy and memory of their own identity. "One as three, and three as one". Grappling with their new forms, the sisters broke free, liberating Flatline's other victims, the twins Skids and Mudflap, in the process. Tales of the Fallen #6 Rising Storm #1

A short time later, the sisters, the Twins, Sideswipe, Topspin, Leadfoot and Roadbuster arrived on Earth on the Wreckers' ship, the Xantium Dark of the MoonDark of the Moon issue 3 in response to a summons beamed into space by Optimus Prime. Joining the allied Autobot-human strikeforce NEST, the new recruits received some training, and were soon called upon to put it into use: the Decepticon Demolishor had been sighted in Shanghai, China. Alliance #4

When NEST discovered that Starscream was selling Transformer weaponry to humans, a sting operation was staged in which Theodore Galloway would pose as a buyer to lure the Decepticons in. When Skystalker, Divebomb and Fearswoop took the bait, Chromia and her sisters joined the twins and the human forces of NEST in tackling them. The sisters did not take kindly to Skystalker's incredulity about the Autobots "sending their women" to do their fighting for them, and killed him with practised ease. The battle aggravated the wounds Arcee had taken in Egypt the previous year. Rising Storm #1

After Sam Witwicky contacted Optimus Prime as Philadelphia was being attacked by Decepticons, Optimus decided that the sisters should be left out of the fight due to Arcee's wounds. Arcee wanted to go despite Chromia's attempt to let her stay behind while her two sisters went. In the end, Optimus decided to allow her to go with Chromia and Elita-1. Rising Storm #2

She and her sisters went to New York thinking they would get information on Starscream selling his weapons to humans, but instead they found Astrotrain and a monster. And they also found out that Shockwave was on earth, so they tried to inform Optimus, but Soundwave jammed their communication and sent his minions after the girls. Arcee and Chromia told Elita-1 to find Optimus. Rising Storm #3

As Ravage was attacking her. Arcee began to feel the pain of her wounds (and Chromia began to feel them too), later Elita-1 died and Arcee and Chromia felt her death. Despite Arcee's attempts to stop her, Chromia activated some bombs they brought with them (which possibly killed Soundwave's minions). Arcee and Chromia survived the explosion. Rising Storm #4

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Chromia and her sisters have hunted Sideways in the past, but he always got away. After begging Optimus Prime, the three of them got another shot at bringing him down. S