The A.R Core (Aron Rora) Is the main heart of Europe Rivera, and it controls every system inside him, The Core Rotates in a diagonal pattern and would often light up if Music from the Stereo System should be played. It wasn't until the war of Rivera 9 when the Tan Army have occupied it and used the power of the Cube in order to shut down Rivera, In which lead to the Arrival of Zero, friends, and lovers to enter him for the first time, where they find out that he is more than 20 things. The A.R. Core basically Improves during Each Millennium and During The Rivera Federation War It was even able to withstand attacks from both Zero and Lovers during the Dark ERA.