Arcee shakes her head slowly, venting out a sigh. "Ultra Magnus, I'm about to disclose some...classified information, so I'm trusting your discretion." If there's anything she can trust Magnus with, it's this. The need to keep this under wraps is becoming increasingly irrelevant at this point. "Optimus didn't leave just to investigate an energy flux. He was going to find Unicron. He was worried Megatron might try to use Unicron's power to gain an upper hand in the war. Optimus wanted to put an end to that before it could even happen."