The Legions of Hell have descended upon the world.
- Phantom Ganon. As was the case with Shadow, he can possess anyone he wishes at any given time. What's stopping him from taking control of one of the main heroes?
- Ganondorf's assault on the Mushroom Kingdom. As Falco points out, the kingdom can readily defend themselves from Bowser, whose plans are very predictable and whose minions aren't all that strong. Then they're suddenly invaded by Ganondorf, who is not only far more cunning than the Koopa King, but also in command of monsters who are built for combat and conquest. When Luigi arrives through the portal to explain the situation, he's very weak—it's possible he barely escaped with his life.
- The sheer size of his army. The forces that invade Bowser's kingdom consist of hundreds of Stalchildren, Shadow Beasts and Darknuts. Word of God has already confirmed the presence of other monsters in the Evil King's ranks (Stalfos, Lizalfos, Gibdos, etc.), not to mention Phantom Ganon. It really cements how powerful Ganon has become, and hints at how long he's thought things through.
- And now it's confirmed that Zant, Ghirahim and Vaati all serve him as well. Given the above mooks and the notable villains already serving Ganondorf, the Evil King's ranks only grow more formidable.
- Ganondorf's plan in general. Assuming the series follows the canon of each fighter's home series, then Ganon has already conquered Hyrule at least once (notice how his forces arrive through portals from his castle). Now his ambitions have expanded further; not only does he want to control Hyrule, he wants to control every conceivable universe.
- The sheer size of his army. The forces that invade Bowser's kingdom consist of hundreds of Stalchildren, Shadow Beasts and Darknuts. Word of God has already confirmed the presence of other monsters in the Evil King's ranks (Stalfos, Lizalfos, Gibdos, etc.), not to mention Phantom Ganon. It really cements how powerful Ganon has become, and hints at how long he's thought things through.
