Seriously, this is one thing that's been bugging me about the FoC campaign, aside from ONE reference when playing as Soundwave it's basically gone? In WFC Dark energon was a driving force of the Decepticon takeover, it was the weapon that turned the tide of the war, there were giant siege engines pile-driving the stuff into everything in sight. The planet was covered in purple crystals and even the glow from the planet was purple. Granted the core is shut down so it's probably not glowing anymore but still, you'd think Megatron would have an ability to blast his enemies with his funky Dark energon bombs that he frequently used in the WFC campaign instead of a lame hover attack. It just feels like they totally forgot about that aspect of the first game altogether and just pretended like it never existed outside of one tiny portion of the game. At least seeing some regions of the game covered in giant crystals or mention of infusing Iinsecticons with it, or SOMETHING would have been nice. It's one of the very few details that bother me in an otherwise great campaign, it's hard to relate the plots when the major evil was totally forgotten, at least have a mission where the Autobots have to shut down the Energon bridge to cut off the Decepticon's supply of Dark Energon, make it somewhat believable instead of just pushing it under the rug.