Magnaron

Overview
Originally a strategic intersection between the east/west Cybertronian Highway and the north/south route, it became the most fiercely contested spot on Cybertron. During a battle in 2006, the Decepticons blew it up, leaving nothing but a deep crater. That state of affairs didn't last for the ill-fated spot. An alien sewage disposal freighter crashed into the crater, releasing its liquid cargo and converting the crater into a noxious lake in 2011. The lake lasted a couple years before being splattered into mist and puddles by a strike from a returned Unicron's pincer, transforming the lake into an abyss in 2013. In 2017, it was filled with Quintessa's ocean water and used as a base of operations by the Quintesson invasion forces. Thus it remains today.

History
Millions of years ago, Magnaron was the biggest intersection on Cybertron, which gave it serious strategic value, and because of that, nowhere else on Cybertron has seen so much fighting. Over the years, Magnaron was transformed from an intersection into a blast crater, a lake of toxic waste, a deep abyss from one of Unicron's pincers, and a lake full of Quintessa's water, a memento of the Quintessons' attempt to retake Cybertron.