- SlashingArbiter
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- Exalted Legendary Member
The Halo 3: Mythic disc is "the complete Halo 3 multiplayer experience" - all 24 maps (original maps shipped with Halo 3, heroic, legendary, mythic 1, and mythic 2 map packs), matchmaking, custom games, forge, and theater. If you install the disc to your hard drive (which is not recommended at all), you will still require the Halo 3: Mythic disc in your console to play it - so don't install it!
And in multiplayer - you can play either as a spartan or an elite. Elites are friends!