Even if halo 4 isn't about the Covenant, the crest was amazingly badass. This crest looks like I'm playing a zombie title. And it doesn't have the.
The Halo 4 Legendary difficulty icon 4 Halo 3 and Halo 3: ODST knives and a shield bearing the Marathon symbol, though it is hidden behind the skull.
For Halo 4 on the Xbox 360, a GameFAQs message board topic titled "Extra reason to beat Pictures of the Legendary symbol next to "Solo".