Originally, the movie would have featured Airachnid teaming up with Unicron and Megatron. Plans were scrapped, thus Airachnid is absent from the film and her final fate was left up in the air. See more
Optimus Prime would deem it a tragedy to stain Cybertron's fresh soil with any newly-spilled energon. So help us prove what Megatron was never willing to: that more than one race can peacefully co-exist on our planet.
You assume that because I turned against Megatron, I can forgive the Autobots their role in the destruction of my brethren on Earth? Leave me be and dare not trespass here again.