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Violen Jiger (バイオレンジャイガー Baiorenjaigā) is Legion. Slain on the battlefield by Autobot hands or otherwise deprived of life while desperately craving more, innumerable vanquished Decepticon souls  refused to find peace in the grave. Rather, they coalesced together on the dead world known as the Tenth Planet, forming the vengeful entity called Violen Jiger.
A demonic force of many faces, minds and voices, Violen Jiger's motivations are unified by the hatred burning in the spirits that comprise him. Now the Decepticons' New Emperor of Destruction,  he uses his supernatural powers to command the warriors who will follow him, granting them abilities and upgrades they'd have never possessed otherwise.
In his corporeal form, Violen Jiger is capable of separating into three enormous, insect-like creatures: Vion (バイオン Baion), Lenja (レンジャー Renjā) and Igern (イガーン Igān). His true form, however, is ghastly, infernal and vulnerable to rainbows.
Sometimes he is referred to as Bio Ranger Iga or the Violent Chigger. If we were you, we'd stick with the usual name.
The entity known as Violen Jiger is a fusion of the souls of slain Decepticon warriors. Zone Part 12 After somehow coming to life on the Tenth Planet, he proceeded to cover the world in dark clouds, blotting out all starlight and turning it into a barren, desolate world. From then on, he would use it as his base of operations. Zone Part 10 Zone Part 12
Violen Jiger next gathered a group of Decepticon giants to serve as his Nine Great Demon Generals; Bruticus, Predaking, Abominus, Menasor, King Poseidon, Devastator, BlackZarak, Trypticon, and Overlord. Under his orders, they took control of various worlds and began construction of a "Decepticon Zone". This caught the attention of Star Saber, who mobilized the Autobot forces of planet Zone against them. Zone Part 1
When the Decepticons attacked planet Feminia, Star Saber was there himself to try to stop them, only to be caught on the planet as it exploded. A month later, Violen Jiger once more sent out his Generals, and while doing so declared that the ultimate goal of the Decepticons was total control of the universe. As part of his plan for this, his Generals stole Energon Z from planet Zone, then travelled to Earth to acquire the Zodiac, so that "Super Energy" could be created by infusing the Zodiac with the Energon Z. This plan was foiled by the arrival of the Powered Masters, Dai Atlas and Sonic Bomber. Transformers: Zone
Violen Jiger's Generals then suffered a series of defeats against the Powered Masters. Zone Part 5 Zone Part 6 In the meantime, however, Metrotitan had emerged from his birthplace beneath the surface of Titan and was taught the ways of evil by the Generals. Zone Part 7
Following Metrotitan's defeat by the newly arrived Road Fire, Violen Jiger appeared on Earth himself. He easily shrugged off the attacks of the Powered Masters, seized the Zodiac, and took the Galaxy Rocket, abducting the Micromaster Moonradar and the Autobot allies Cain, Akira, and Emusa in the process. He then returned to the Tenth Planet with his prizes, as the Powered Masters in their Big Powered spaceship form followed in hot pursuit. Zone Part 10
When the Powered Masters arrived, Violen Jiger separated into his three insectoid components—Vion, Lenja, and Igern—and attacked the Autobots. While Igern battled Sonic Bomber in the air, Lenja threatened the Galaxy Rocket and its occupants, prompting Road Fire to safeguard it. Vion went after Dai Atlas himself, and was felled by the hero's Double Powered Cutter attack—losing the Zodiac to him in the process. Igern and Lenja, too, soon fell against their opponents. But Violen Jiger was not yet defeated. Zone Part 11
In outer space, Violen Jiger revealed his true form: a phoenix-like, skull-headed flaming mass composed of Decepticon spirits. Surely, the Powered Masters were no match for this! However, placing their hands on the Zodiac and focusing their minds, the Powered Masters were able to combine into their Big Powered form, but with thirty times its normal strength! The super-vehicle plowed through the creature, leaving a rainbow trail in its wake. Thus, Violen Jiger was defeated by the Rainbow Powered Attack! 
With Violen Jiger vanquished, the Tenth Planet was freed from the miasma of evil he had surrounded it with, and became a true paradise for humans and Transformers alike. Zone Part 12
During the ongoing war between Autobots and Decepticons, the new Emperor of Destruction Violen Jiger and his Nine Great Demon Generals (Bruticus, Predaking, Abominus, Menasor, King Poseidon, Devastator, BlackZarak, Trypticon, and Overlord) appeared without warning, heralding a new phase of battle.
For reasons unknown, Violen Jiger's Generals Overlord, Abominus, and Menasor laid waste to Planet Feminia,  completely destroying the world and nearly killing Victory Saber in the process.
Later, in a swirling cloud of space, the Generals gathered before the humongous spectral form of their leader, who proclaimed Victory Saber to have been vaporized. Following a short cheer from his minions, Violen Jiger stated his intention to take over nearby space to create a "Decepticon Zone". As he switched between his three faces, however, he revealed that he required "Super Energy" to do so—which he would have his Generals gather by any means necessary.