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The Nega-Core is an ominous device developed by Jhiaxus, which will enable the coming Expansion. There are three such devices scattered throughout the "normal" universe, each one guarded by an all-but-invincible Transformer that is under Jhiaxus' remote command. These guardians are Thunderwing, Sixshot, and Monstructor.
IDW comics continuity
|This section covers fiction that is ongoing. It will be added to as the story progresses. If it isn't current, you can help by updating it.|
Arcee, in her rampage to destroy all things Jhiaxus, attacked a facility that housed the Nega-Core. Ultra Magnus managed to incapacitate her before she destroyed it, while Jhiaxus' drones informed him that the device was undamaged.
Once the Nega-Core was complete, Nemesis Prime dispatched Cyclonus on a mission to activate the Nega-Core on Corata-Vaz and its guardian in preparation for the Expansion. Cyclonus allowed himself to become distracted by the Ark-12 and barely reached his target in time. He initially planned to ignore his secondary objective, out of a personal distaste for what Thunderwing had done to Cybertron (see Stormbringer), but was ultimately forced to activate the guardian when Ultra Magnus and the Ark-12 crew followed his trail to the Nega-Core's hiding place.
The two other Nega-Cores are on the planet Rotan and the fourth moon of Bhul, guarded by Monstructor and Sixshot.